30 Best Postman Alternatives in 2025 | Free & Open Source API Testing Tools

Postman has long been the go-to tool for API development, offering API design, testing, and documentation. This has made it ubiquitous in the software industry for nearly a decade.

However, Postman's dominance faced a shakeup in 2021 when the company implemented significant changes to its pricing plan, eliminating unlimited user licenses in favor of a monthly fee per user. These alterations have prompted many developers to seek free, open-source, cost-effective Postman alternatives.

Fortunately, the API tooling landscape has expanded considerably, now teeming with feature-rich, often free or open-source API testing tools. In this article, we'll provide you with a comprehensive overview of their features, advantages, and disadvantages.

Why Users Are Moving Away from Postman?

Postman has been a go-to tool for API development and testing for years. But for many users, the limitations of its free plan become a dealbreaker — especially as projects grow and teams scale. Here’s what’s pushing users to explore alternatives:

1. API Creation Limits: You can only create 3 APIs on Postman’s free plan.
   For teams working on larger projects or microservices, this quickly becomes a problem. Developers often need more flexibility — not restrictions.
2. Only 25 Collection Runs Per Month: The Collection Runner is essential for running tests, but the free plan limits you to just 25 runs per month.
   If you’re testing frequently, this cap slows down your workflow — unless you upgrade or switch tools.
3. Low API & Mock Server Call Limits: Postman’s free plan allows: 1,000 API calls/month & 1,000 mock server calls/month. For anything beyond basic testing or development, these limits feel tight. High-traffic projects hit the ceiling fast, leaving users searching for tools with more generous usage.
4. Only 5 Flows for Automation: With automation becoming a must, Postman’s limit of 5 flows is restrictive. If you want to build and automate complex workflows, this cap can be frustrating — especially for teams aiming to streamline repetitive tasks.
5. Collaboration Capped at 3 Users: Good API development is a team effort — but Postman’s free plan only supports 3 team members. As teams grow, this restriction forces an upgrade or a move to a more collaboration-friendly platform.

These limitations — from API caps to collaboration barriers — can disrupt your development process and slow your team down. That’s why more users are moving to tools that offer more freedom, better collaboration, and fewer limits from day one.

30 Popular Postman Alternatives for API Testing

Here is an Overview of the 30 postman alternative. You can click the TOC on the left to check out the product details, key features, websites, pricing, pros and cons and learn why choosing the tool as a postman alternative.

1. Apidog: The Best Postman Alternative of All

Say goodbye to tool overload and disconnected workflows. Apidog is your all-in-one API development platform that does it all — from designing and documenting to debugging, testing, mocking, and collaborating on APIs — all in one sleek, powerful interface.

Whether you're a solo developer or part of a fast-moving product team, Apidog is built to help you build faster, test smarter, and work better together.

Website: Apidog

Git: https://github.com/Apidog

Why Teams are Switching to Apidog? — Key Features of Apidog:

• Visual API Design Made Effortless: Build your APIs with ease using Apidog’s intuitive visual dashboard. Drag, drop, and define your endpoints — no more juggling between design specs and test tools. It’s fast, smooth, and visually clear.
• Auto-Generated Documentation That Stays in Sync: Design your API once, and let Apidog take care of the rest. It automatically creates clean, interactive documentation you can share with teammates, stakeholders, or clients — keeping everyone aligned, always. Learn more about API Design and Documentation!
• Real-Time Debugging + Robust API Testing: Debug and test your APIs in real-time with detailed request/response logs and error reports. Whether you're running quick manual tests or automating complex test cases, Apidog ensures your APIs perform perfectly across environments. Learn more about API Debugging and testing!
• Powerful Mocking Without the Backend: No backend? No problem. Use Apidog’s advanced mocking feature to simulate API responses instantly. Perfect for parallel frontend-backend development and rapid prototyping. Learn more about API Mocking!
• Seamless Team Collaboration: Work together, not in silos. With API Versioning, Sprint Branches, and Shareable Online Docs, Apidog helps your team collaborate on APIs just like you would in Git — faster feedback, smoother merges, and better teamwork. Learn more about API Collaboration!
• Enterprise-Ready Access Controls: Manage large teams with confidence using SSO (Single Sign-On) and SCIM support. Control user access at scale and keep your organization secure while staying developer-friendly.
• Apidog MCP Server: The Apidog MCP Server turns your API specification into a dynamic data source for AI-powered tools like Cursor. Now, Agentic AI can understand, reference, and interact with your API docs in real time. Learn about how the Apidog MCP Server works.

These features make Apidog a robust platform for API development, testing, and collaboration.

Pricing of Apidog:

Apidog offers a generous free plan with a wide range of features, including API design, debugging, testing, and documentation tools. It's ideal for individual developers or small teams. Paid plans are highly affordable compared to competitors, offering more advanced features like database connections, higher test scenario limits, and additional team management capabilities.

The pricing structure is designed to be budget-friendly while providing powerful API development functionalities, making Apidog a cost-effective solution for teams of all sizes.

Pros of Apidog:

• Free Plan with Rich Features: Offers extensive features like API design, testing, and documentation at no cost.
• All-in-One Tool: Apidog covers every aspect of API development, making it the only tool you need.
• Direct API Testing: Test APIs directly from the automatically generated documentation.
• Comprehensive API Test Report: Receive clear, actionable insights from test reports, allowing you to identify and resolve errors swiftly.
• One-Click Database Connection: Simplifies connecting to databases.
• Client Code Generator: Quickly generates deployable client code for projects.

Cons of Apidog:

• Frequent updates may be needed cause the platform takes the measure of agile development.

Why Choosing Apidog: Apidog simplifies the API development process with its all-in-one platform, offering features like design, debugging, and testing in one place. It stands out with a rich free plan, direct API testing on auto-generated documentation, and quick code generation for deployment. Additionally, its affordable paid plans provide scalability for larger teams, making it an ideal choice for developers seeking efficiency and comprehensive functionality in API management.

2. NativeRest: Free Postman Alternative for Rest API

NativeRest is a fast and lightweight REST API client for creating, debugging, and testing REST API. NativeRest is a 100% native desktop application for testing your API that does not use Electron. NativeRest starts fast and uses less memory and CPU. NativeRest, unlike other popular tools, can be used without an account and internet connection.

Website: NativeRest

Git: https://github.com/nativesoftcom/nativerest

Key Features of NativeRest:

NativeRest is a high-performance REST API client specifically built for Windows, macOS, and Linux. It differentiates itself by avoiding memory-heavy frameworks like Chromium, Electron, or Node.js, making it more efficient in terms of performance. Here's a breakdown of its key features:

• Native Application: Lightweight and efficient, it doesn't rely on bulky web technologies.
• Comprehensive HTTP Requests: Users can easily create and send HTTP requests, complete with headers, parameters, and body data. It supports common HTTP methods such as GET, POST, PUT, PATCH, and DELETE.
• Advanced Body Data Handling: It allows users to send structured data using various formats, such as JSON, HTML, or XML, with syntax highlighting and automatic content-type headers.
• Code Generation: The tool offers built-in code generation for different programming languages, making it easy to implement API requests in real-world projects.

NativeRest also includes features like environment variables, request templates, and workspace management, enhancing productivity for developers who frequently work with APIs.

Pricing of NativeRest:

NativeRest offers flexible pricing tailored to developers' needs. While there is no free tier, NativeRest's pricing is competitive, offering high value for its native, high-performance design.

Pros of NativeRest:

• High-performance and memory-efficient: NativeRest is a 100% native application, that is compiled for Windows, macOS, and Linux. It starts fast and uses less memory and CPU.
• Working in offline mode: NativeRest can be used without an internet connection. You decide to use only local workspaces or additionally create cloud workspaces.
• Preconfigured proxy server: Use a high-performance preconfigured proxy server from NativeRest. You can also configure NativeRest to use a custom proxy configuration when sending requests.
• Import and export data: You can import data from other popular clients. You can migrate without loss of earlier created collections, environments, and variables. It also supports data export.
• Multilingual User Interface: NativeRest is a multilingual HTTP client that supports multiple languages. Currently, it supports 10 languages.
• Full-featured portable version: NativeRest is available in a portable version as well. The portable version is distributed as a single executable file and does not require administrator privileges.

Cons of NativeRest

• No Free Plan: Unlike some competitors, NativeRest doesn't have a free version, which may limit its appeal for smaller teams or individual developers.
• Less Popular: It doesn't have the same community or resource support as larger tools like Apidog or Postman, which could be a downside for those needing more external tutorials and guides.

Why Choosing NativeRest: Choosing NativeRest comes down to its focus on high performance, efficiency, and native integration. Unlike many other API clients built on heavy frameworks like Electron, NativeRest is designed as a native app for Windows, macOS, and Linux. This allows it to run faster and use fewer system resources, making it an excellent choice for developers who work with large API projects or multiple simultaneous requests.

3. Swagger UI: Open Source Postman Alternative with Documentation

Swagger UI is one of the open-source Postman alternatives for API design, documentation, and testing. The Swagger Petstore is a sample API provided by Swagger/OpenAPI to demonstrate their capabilities. It is a RESTful API that handles pet data, enabling users to perform CRUD operations on pets through standard HTTP methods like GET, POST, PUT, and DELETE.

Website: Swagger UI

Git: https://github.com/swagger-api/swagger-ui

Key Features of Swagger UI:

Swagger provides a powerful suite of tools for API development, offering both open-source and professional solutions to streamline API design, testing, documentation, and management. Key features include:

• Swagger Editor: A browser-based tool for designing APIs using OpenAPI and AsyncAPI specifications with real-time feedback.
• Swagger UI: An interactive UI that visualizes API resources, making it easy to explore and test APIs without needing implementation logic.
• Swagger Codegen: Automatically generates client libraries, server stubs, and API documentation from OpenAPI definitions, reducing manual coding efforts.
• API Governance: Enforces design standards across teams, ensuring consistent API development and regulatory compliance.
• Collaboration Tools: SwaggerHub, designed for team collaboration, includes role-based access controls and supports API discoverability with integration into API gateways and version control systems.

These features help teams efficiently develop, document, and manage APIs, improving workflow and scalability.

What is Swagger API? A Complete Guide for Beginners

Swagger simplifies the process of creating and maintaining API documentation through a user-friendly interface and various features.

Apidog BlogAhmed Waheed

Pricing of Swagger UI:

Swagger UI itself is open-source and free to use. It’s part of the Swagger ecosystem, which provides tools for API development and documentation. However, if you're looking for additional features or enterprise support, you might need to look into Swagger’s commercial offerings.

Pros of Swagger UI:

• Interactive documentation: Swagger UI generates interactive documentation for APIs, which can be easily shared with stakeholders to provide a clear understanding of the API's capabilities and uses cases.
• API testing: Swagger UI allows developers to test their APIs directly from the documentation page, which can help identify any issues or errors in the API.

Cons of Swagger UI:

• Limited functionality: Swagger UI is primarily a documentation tool, and its testing capabilities may be limited compared to dedicated API testing tools.
• Limited customization: The tool has limited customization options, which may be a disadvantage for developers who require more control over the look and feel of their API documentation.

Why Choosing Swagger UI: Choosing Swagger UI offers several compelling benefits for API development and documentation. It provides interactive, real-time testing capabilities directly within the documentation, enhancing user understanding and ease of use. As an open-source and free tool, Swagger UI is cost-effective, making it suitable for both small projects and large implementations. It adheres to the widely recognized OpenAPI Specification, ensuring consistency and interoperability with other tools.

4. Insomnia REST Client: Popular Open Source Postman Alternative

Insomnia is a popular alternative to Postman. It's an open-source API client that allows you to design and test your APIs. Insomnia Rest Client provides a sleek and intuitive interface that makes it easy to organize your API requests and responses. It also offers a range of features, including code generation, OAuth authentication, and automatic cookie management.

Website: Insomnia REST Client

Git: https://github.com/Kong/insomnia

Related Reading:

Postman vs Insomnia: Which API Testing Tool is Right for You

In this post, we will compare the features and functionality of Postman and Insomnia, as well as their pros and cons, to help you choose the right API testing tool for your needs.

Apidog BlogKim Haewon

Key features of Insomnia:

Some of the key features of Insomnia include:

• Powerful API Design: Insomnia provides a comprehensive API design experience, allowing users to build and test APIs efficiently with a range of tools and integrations.
• GraphQL Support: It offers robust support for GraphQL, enabling users to create and manage GraphQL queries and mutations seamlessly.
• Environment Variables: Insomnia allows for the use of environment variables to manage different configurations and endpoints, simplifying testing and development across various environments.
• API Testing and Debugging: The tool includes advanced testing and debugging features, making it easier to identify issues and ensure API functionality.
• Authentication Options: Insomnia supports various authentication methods, including OAuth2, JWT, and API keys, to secure API interactions.
• Collaborative Features: It includes collaboration tools to share workspaces and sync data across teams, facilitating better team coordination and project management.
• Customization and Extensibility: Insomnia offers customization options and supports plugins and extensions, allowing users to tailor the tool to their specific needs and workflows.

Pros of Insomnia:

• Insomnia is a cross-platform tool, which means it can be used on Windows, Mac, and Linux operating systems.
• The user interface of Insomnia is user-friendly and easy to navigate, which makes it ideal for both technical and non-technical users.
• Insomnia offers code snippets for API requests in multiple programming languages, including JavaScript, Python, and Ruby.
• The tool also supports environment variables, which enables users to manage complex testing scenarios easily.
• Insomnia supports collaboration features, allowing team members to work together on API development projects.
• It can be automated using scripts, making it easy to integrate API testing into continuous integration and deployment (CI/CD) workflows.

Cons of Insomnia:

• While Insomnia is generally fast and responsive, it may encounter performance issues when working with large or complex APIs.
• Although it is a free and open-source tool, some of the advanced features may require a paid subscription.
• The tool may not have all of the features that some users may require for API development and testing.

Why Choosing Insomnia REST Client: Choosing Insomnia REST Client offers a range of benefits that streamline API development and testing. Its powerful design capabilities and robust support for GraphQL enable users to efficiently build and manage APIs. The client’s advanced testing and debugging features, combined with support for various authentication methods, ensure thorough and secure API interactions.

5. Paw(Rapid API): Powerful Postman Alternative on Mac

Paw(Rapid API) is a powerful API testing and development alternative to Postman for Mac. It provides a range of features, including code generation, automatic validation, and dynamic values. One of its standout features is the ability to generate client code in multiple languages.

Website: Paw(Rapid API)

Git: https://github.com/luckymarmot

Key features of Paw(Rapid API):

Paw(Rapid API) is a powerful API client designed for macOS that offers a variety of features to streamline API development and testing. Key features include:

• Advanced API Testing: Paw provides a robust environment for designing, testing, and debugging APIs with detailed request and response handling.
• GraphQL and REST Support: It supports both GraphQL and REST APIs, allowing for versatile API management.
• Dynamic Values and Environments: Users can use dynamic values and manage multiple environments with environment variables for efficient API testing and configuration.
• Interactive API Documentation: Paw generates interactive documentation that updates automatically as APIs evolve.
• Customizable Workflows: It offers customizable workflows and the ability to create complex requests with built-in code generation for various programming languages.
• Collaboration Tools: Paw includes features for sharing and collaborating on API projects with team members, enhancing team productivity.

Pricing of Paw(Rapid API):

Paw(Rapid API) for Mac is free for personal and professional use.

Pros of Paw(Rapid API):

• Code generation: Paw offers a code generation feature that generates client code in multiple languages, making it easier to integrate APIs with different programming languages.
• Dynamic values: Paw provides a dynamic value feature that allows developers to create custom values that can be used in requests and responses.
• Automatic validation: Paw automatically validates requests and responses, ensuring that APIs are functioning correctly.
• Advanced features: Paw offers advanced features such as OAuth authentication, support for scripting languages, and automatic cookie management.

Cons of Paw(Rapid API):

• Only available for Mac: Paw is only available for Mac users, which limits its accessibility for developers using other operating systems.
• Cost: Paw offers a free trial, but the full version can be costly for individual developers or small teams.
• Limited support for Swagger and RAML: Paw has limited support for Swagger and RAML, which may not be ideal for developers who heavily rely on these API design standards.

Why Choosing Paw(Rapid API): Choosing Paw(Rapid API) provides a sophisticated API development experience with its extensive feature set tailored for macOS users. Its advanced API testing capabilities and support for both GraphQL and REST make it versatile for various development needs.

6. Apigee: Comprehensive API Management Tool as Postman Alternative

Apigee, a part of Google Cloud, is a comprehensive API management platform designed to help businesses manage, secure, and scale their APIs. It provides a range of tools and services to streamline API lifecycle management, enhance security, and improve API performance.

Website: Apigee

Git: https://github.com/apigee

Key Features of Apigee:

• API Gateway: Apigee offers a powerful API gateway that handles traffic management, request and response transformations, and provides robust routing and load balancing capabilities.
• Security and Access Control: It includes advanced security features such as OAuth2, API key management, and threat protection to safeguard APIs against unauthorized access and attacks.
• Analytics and Monitoring: Apigee provides detailed analytics and monitoring tools to track API performance, usage, and health, helping identify and resolve issues quickly.
• Developer Portal: It includes a customizable developer portal that allows API providers to publish and manage API documentation, engage with developers, and facilitate API adoption.
• Traffic Management: Apigee offers features for rate limiting, quota management, and traffic shaping to ensure API stability and performance under varying loads.
• API Lifecycle Management: The platform supports the full API lifecycle, from design and development to testing, deployment, and retirement, with tools to streamline each phase.
• Integration Capabilities: Apigee integrates with various third-party tools and services, providing flexibility in managing and extending API functionality.

Pricing of Apigee:

Apigee's pricing is based on usage and deployment options.

Pros of Apigee:

• Scalability: Apigee can handle large volumes of API traffic, making it suitable for enterprises and organizations with high traffic and complex API requirements.
• Multi-cloud support: Apigee can be deployed in multiple cloud environments, including Amazon Web Services, Microsoft Azure, and Google Cloud, which provides flexibility and choice for organizations.
• Developer-friendly: Apigee offers a range of developer tools and resources, including a developer portal, documentation, and API testing tools, to help developers build and test APIs.

Cons of Apigee:

• Cost: Apigee can be expensive for small organizations or those with limited API usage.
• Complexity: The platform can be complex, and its steep learning curve can make it difficult for less experienced developers to use it effectively.
• Support: Some users have reported issues with Apigee's customer support, specifically regarding response time and quality.

Why Choosing Apigee: Choosing Apigee offers several advantages for organizations looking to manage their APIs effectively. Its comprehensive API management features, including robust security, advanced analytics, and traffic management, help ensure that APIs are secure, performant, and reliable.

7. SoapUI: Another Postman Alternative for REST API and SOAP API

SoapUI is a free open-source Postman alternative that allows you to test both REST and SOAP APIs. It provides a range of features, including testing, mocking, and security testing. SoapUI also offers an intuitive and user-friendly interface that makes it easy to design and test your APIs.

Website: SoapUI  

Git: https://github.com/SmartBear/soapui

Key Feature of SoapUI:

• Functional Testing: SoapUI allows for thorough testing of API endpoints, including the creation of complex test scenarios, assertions, and data-driven testing.
• Support for SOAP and REST: It provides support for both SOAP and RESTful web services, making it versatile for various types of APIs.
• Advanced Test Case Design: Users can design complex test cases with features like property transfers, scripting, and dynamic data handling.
• Mock Services: SoapUI can create mock services to simulate API responses, enabling testing of clients even when the actual service is not available.
• Performance Testing: It includes tools for performance and load testing, allowing users to measure how APIs handle different loads and identify performance bottlenecks.
• Security Testing: SoapUI offers security testing capabilities to check for vulnerabilities such as SQL injection, cross-site scripting (XSS), and more.
• User Interface: The tool features an intuitive user interface that simplifies test creation, execution, and analysis.

Pricing of SoapUI:

SoapUI offers both open-source and commercial versions.

Pros of SoapUI:

• SoapUI is a popular API testing alternative to postman that supports both REST and SOAP API.
• SoapUI offers a user-friendly interface for creating and executing test cases, making it easy for both technical and non-technical users to use.
• The tool supports multiple protocols and data formats, making it easy to test APIs across different platforms and technologies.
• SoapUI offers integration with popular development tools such as Eclipse and IntelliJ IDEA, allowing developers to seamlessly incorporate API testing into their development workflows.

Cons of SoapUI:

• SoapUI can be resource-intensive, and its performance may suffer when testing large or complex APIs.
• The user interface can be overwhelming for new users, and it may take some time to learn how to use all of the features effectively.
• Some users have reported issues with the tool's stability and occasional crashes, particularly when working with large datasets or complex test cases.

Why Choosing SoapUI: Choosing SoapUI provides several advantages for API testing and quality assurance. Its robust feature set supports comprehensive functional, performance, and security testing for both SOAP and REST APIs. The ability to create mock services and conduct load testing adds flexibility and depth to the testing process.

8. Runscope: Cloud Based Postman Alternative for API Testing

Runscope is another Postman alternative with cloud-based API testing and monitoring. It allows you to test and monitor your APIs from multiple locations around the world. Runscope provides a range of features, including automatic test generation, webhook testing, and API debugging. It also offers a range of integrations, including Slack, PagerDuty, and HipChat.

Website: Runscope

Git: https://github.com/Runscope

Key Feature of Runscope:

• API Testing: Runscope allows users to create and execute automated tests for APIs, including functional and regression tests, to ensure they meet expected standards.
• Monitoring: The tool provides real-time monitoring of APIs to track performance, uptime, and reliability. It helps detect issues and anomalies before they impact end users.
• Request and Response Validation: Runscope offers detailed validation of API requests and responses, including status codes, headers, and body content, to verify that APIs return correct and expected results.

Pricing of Runscope:

Runscope offers a range of pricing plans based on the size of the team and the features required.

Pros of Runscope:

• Runscope is easy to use and offers a user-friendly interface.
• The tool provides a variety of testing and monitoring options, including automation, real-time monitoring, and integration with other popular tools.
• Runscope offers advanced features, such as scriptable tests and request chaining, that allow for more complex testing scenarios.
• The tool can be deployed either in the cloud or on-premise, depending on the organization's needs.

Cons of Runscope:

• Some users have reported that Runscope can be complex to set up and configure, which may be a barrier for some developers.
• The tool may not be as intuitive as other API testing tools, which could lead to a steeper learning curve.
• The pricing model for Runscope may not be ideal for all organizations, particularly for those with smaller budgets.

Why Choosing Runscope: Choosing Runscope provides several benefits for managing and ensuring the quality of APIs. Its comprehensive API testing and monitoring capabilities help detect and address issues proactively, improving API reliability and performance.

9. Boomi: Postman Alternative with Low Code UI

Boomi is a cloud-based integration platform that offers solutions for integrating data and applications. It allows users to create integrations without the need for extensive coding, using a low-code platform.

Website: Boomi

Git: https://github.com/OfficialBoomi

Key Feature of Boomi:

• API Management: Boomi includes API management features to design, deploy, and monitor APIs, facilitating secure and scalable API interactions.
• Pre-built Connectors: The platform offers a wide range of pre-built connectors for popular applications, databases, and services, speeding up the integration process and reducing development time.
• Low-Code Development: Boomi’s visual, drag-and-drop interface enables users to design integrations and workflows with minimal coding, making it accessible to users with varying technical skills.
• Scalability: Boomi is designed to scale with business needs, supporting everything from small projects to large-scale enterprise integrations.

Pricing of Boomi:

Boomi’s pricing is typically customized based on the specific needs of the organization, including factors such as the number of integrations, data volume, and required features.

Pros of Boomi:

• Cloud-based: Being cloud-based, Boomi offers scalability and flexibility, as well as easy access to data from anywhere.
• Wide range of connectors: Boomi has a large library of connectors, allowing it to integrate with a wide variety of applications and systems.
• Low-code platform: Boomi's low-code platform allows for rapid development and deployment of integrations, reducing the need for extensive coding.
• Strong security features: Boomi offers robust security features, including encryption, access control, and compliance with various regulations.

Cons of Boomi:

• Cost: Boomi can be expensive, especially for small businesses or individuals. The pricing structure is based on usage, which can add up quickly for organizations with high integration needs.
• Limited customization: Boomi's low-code platform may not allow for as much customization as some organizations require, especially if they have specific integration needs.
• Reliance on Internet connectivity: Being cloud-based, Boomi is dependent on Internet connectivity. Any disruptions or downtime can impact the availability of data and integrations.

Why Choosing Boomi: Choosing Boomi provides several strategic advantages for organizations looking to streamline their integration and data management processes. Its powerful integration capabilities and pre-built connectors simplify the connection of disparate systems, both on-premises and in the cloud.

10. Restlet Studio: Web Based Postman Alternative for API Design

Restlet Studio is a web-based API design and testing tool. It provides a range of features, including API design, testing, and documentation. Restlet Studio also offers an intuitive and user-friendly interface that makes it easy to organize your API requests and responses. It also offers a range of integrations, including GitHub, Swagger, and RAML.

Website: Restlet Studio

Git: https://github.com/restlet

Key Features of Restlet Studio:

• API Design: Restlet Studio allows users to design APIs using the OpenAPI Specification (formerly Swagger), providing a structured and standardized approach to API development.
• Interactive Documentation: The platform generates interactive API documentation that is automatically updated as the API evolves, helping users understand and use the API effectively.
• Mock Servers: Restlet Studio provides the ability to create mock servers to simulate API responses, enabling developers to test and iterate on API designs even before the actual implementation is complete.
• Testing and Validation: Users can perform tests and validate APIs within the platform, checking for compliance with the API specification and ensuring that the API functions as expected.

Pricing of Restlet Studio:

Restlet Studio offers various pricing tiers, including free plan and paid plans.

Pros of Restlet Studio:

• Comprehensive feature set: Restlet Studio offers a range of features, including support for various API types and methods, code generation, and documentation tools, which can help streamline the API development process.
• Collaboration tools: Restlet Studio supports collaboration and teamwork by enabling team members to work on API development and testing projects together.
• Cloud-based and Lightweight: Being a cloud-based tool, Restlet Studio offers the advantage of easy accessibility from any location and device with an internet connection.

Cons of Restlet Studio:

• Limited functionality: Restlet Studio's free version has certain limitations, such as fewer API calls per day and limited storage space.
• Pricing: The pricing of Restlet Studio can be a bit expensive for smaller teams and organizations.
• Steep learning curve: While the interface is user-friendly, the tool can be complex, which can lead to a steeper learning curve for less experienced developers.

Why Choosing Restlet Studio:

Choosing Restlet Studio provides several benefits for API design and management. Its support for the OpenAPI Specification ensures that APIs are designed consistently and adhere to industry standards. The interactive documentation and mock server features facilitate effective testing and development, allowing teams to validate and iterate on API designs before full implementation.

11. Thunder Client: Postman Alternative for VSCode

Thunder Client extension, a user-friendly and lightweight GUI-based REST API testing tool, seamlessly integrates into Visual Studio Code. It has witnessed a surge in popularity, distinguishing itself from alternatives to Postman.

Website: Thunder Client

Git: https://github.com/thunderclient

Key Features of:

• VS Code Integration: Thunder Client integrates seamlessly with Visual Studio Code, allowing developers to manage API testing and development within their existing coding environment.
• Easy Request Management: The tool offers a user-friendly interface for creating, sending, and managing API requests. It supports various HTTP methods, including GET, POST, PUT, DELETE, and more.
• Response Visualization: Thunder Client provides detailed response visualization, including headers, status codes, and response bodies, to help users understand and debug API interactions.
• Environment Variables: Users can define and use environment variables to manage different configurations and endpoints, facilitating testing across multiple environments.

Pricing of Thunder Client:

Thunder Client offers a free version with essential features and also premium plans for advanced features.

Pros of Thunder Client:

• User-Friendly Interface: Thunder Client boasts a simple and intuitive GUI, making it accessible for users of all levels.
• Seamless Integration: Integrated as an extension in Visual Studio Code, Thunder Client seamlessly aligns with the developer workflow.
• Lightweight Design: With a minimalist approach, Thunder Client ensures a smooth and quick performance without unnecessary bloat.
• Collections and Environment Support: Efficiently organize and manage APIs using Collections, and utilize Environment Variables for flexible testing scenarios.

Cons of Thunder Client:

• Limited Advanced Features: While Thunder Client is user-friendly, it may lack some advanced features compared to more comprehensive testing tools.
• Limited Extensibility: Thunder Client's extensibility may be limited for users who require highly customizable and extensible testing environments.
• Dependency on Visual Studio Code: As an extension for Visual Studio Code, Thunder Client's usage may be restricted to users who prefer or are limited to this specific IDE.

Why Choosing Thunder Client: Choosing Thunder Client offers several advantages for API testing and development within Visual Studio Code. Its seamless integration with VS Code provides a streamlined workflow, allowing developers to manage API requests and code in a single environment.

12. Talend API Tester: Free Postman Alternative for Rest APIs

Talend API Tester - Free Edition is a user-friendly Chrome and Firefox browser extension empowering developers and testers to send HTTP requests and analyze responses directly in their web browsers.

Website:  Talend API Tester

Git: Non

Key Features of Talend API Tester:

• API Testing: Talend API Tester allows users to create and execute various types of API tests, including functional, regression, and performance tests, to ensure API reliability and accuracy.
• Support for Multiple API Types: The tool supports both REST and SOAP APIs, offering versatility in testing different types of web services.
• Advanced Assertions: Users can define complex assertions to validate API responses against expected values, including checking status codes, response times, and data content.

Pricing of Talend API Tester: Free

Pros of  Talend API Tester

• Data-Driven Testing: Allows for data-driven testing, enabling users to test APIs with different input scenarios, improving test coverage.
• Automated Testing Capabilities: Supports automation of API tests, streamlining the testing process and ensuring consistency in test execution.
• Environment and Variable Management: Efficiently manages testing environments and variables, enhancing adaptability in different testing scenarios.

Cons of  Talend API Tester

• Limited Community Support: Compared to more widely adopted testing tools, Talend API Tester may have a smaller community, potentially resulting in fewer online resources and community support.
• Resource Intensive: Depending on the scale of testing, Talend API Tester may be resource-intensive, requiring adequate system specifications for optimal performance.

Why Choosing Talend API Tester: Choosing Talend API Tester provides several strategic benefits for organizations focused on API quality and performance. Its comprehensive testing and monitoring capabilities ensure that APIs function correctly and meet performance standards. The support for both REST and SOAP APIs, along with advanced assertions and automated testing features, allows for thorough and efficient testing processes.

13. Testfully: Postman Alternative for Automated Testing

Testfully, a Postman alternative, is an API testing tool with automated testing capabilities. It offers both cloud and offline storage options and supports team collaboration through access controls and private vaults.

Website: https://testfully.io/

Git: https://github.com/testfully

Key Features of Testfully:

• API Testing: Testfully enables users to create and execute a variety of API tests, including functional, regression, and performance tests, to validate API endpoints and responses.
• User-Friendly Interface: The tool offers an intuitive and easy-to-use interface, making it accessible for both technical and non-technical users.
• Support for Multiple API Types: Testfully supports testing for both REST and GraphQL APIs, providing flexibility in testing different types of web services.
• Test Automation: It includes features for automating tests and scheduling them to run at specified intervals, integrating with CI/CD pipelines to streamline the development workflow.

Pricing of Testfully:

Testfully offers various pricing plans based on the features and usage requirements.

Pros of Testfully:

• Smooth Postman transition with importer tool
• Free forever plan for individuals and small teams
• Simple, transparent pricing model
• Public roadmap based on customer input
• Team collaboration features

Cons of Testfully

• Currently lacks SOAP, gRPC, WebSocket support but these are on roadmap

Why Choosing Testfully: Choosing Testfully offers several advantages for API testing and management. Its user-friendly interface and support for multiple API types make it accessible and versatile for different testing needs. The tool's automation features and integration with CI/CD pipelines enhance efficiency and streamline the testing process.

14.  Bruno: Another Open Source Free Postman Alternative

Bruno is a cutting-edge, open-source API client designed to transform the landscape dominated by tools like Postman and Insomnia. Bruno offers speed, Git-friendliness, and a unique approach to revolutionize your API testing experience.

Website: Bruno

Git: https://github.com/usebruno/bruno

Key Features of Bruno:

• API Design: Bruno provides tools for designing APIs with a focus on usability and ease of creation. It supports various API design standards and offers features for defining endpoints, request/response formats, and documentation.
• API Testing: The platform allows users to create and execute API tests to validate functionality, performance, and security. It supports both automated and manual testing approaches.
• Mocking Services: Bruno includes functionality for creating mock services, enabling developers to simulate API responses and test client applications even before the actual API is implemented.
• Collaboration: Bruno emphasizes team collaboration by providing features for sharing API designs, test cases, and results with team members, facilitating better coordination and feedback.

Pricing of Bruno: Bruno's pricing is based on the number of users.

Pros of Bruno

• Local Collection Storage: Bruno stores your API collections directly in a folder on your filesystem, promoting simplicity and transparency in data management.
• Bru Markup Language: Utilizing the plain text markup language, Bru, Bruno efficiently captures and saves information about API requests, ensuring clarity and ease of use.
• Git Collaboration: Collaborate seamlessly over API collections using Git or any version control system of your choice. Bruno empowers teams to work together efficiently.

Cons of Bruno

• Offline-Only Operation: Bruno operates strictly offline, prioritizing data privacy. Unlike other tools, there are no plans for cloud-sync in Bruno, emphasizing the importance of keeping your data on your device.

Why Choosing Bruno: Choosing Bruno offers several benefits for API development and testing. Its user-friendly design tools and support for various API standards simplify the creation and management of APIs. The platform's comprehensive testing capabilities, including mocking and detailed analytics, help ensure that APIs perform as expected and meet quality standards.

15. Yaak: Open Source Postman Alternative for Debugging APIs

Yaak is an open-source API client that allows users to test and debug their APIs directly from the command line. It supports various protocols such as HTTP, WebSocket, and Server-Sent Events.

Website: Yaak

Git: https://github.com/dietmap/yaak

Key Features of Yaak:

• API Design: Yaak provides tools for designing APIs with support for various design standards. It offers a user-friendly interface for defining API endpoints, data models, and request/response formats.
• API Testing: The platform allows users to create and run comprehensive tests for APIs, including functional, regression, and performance tests, to ensure APIs meet expected standards.
• Mock Services: Yaak includes the ability to create mock services to simulate API responses, allowing developers to test applications even before the actual API is live.
• Performance Monitoring: Yaak provides performance monitoring tools to track API performance metrics, such as response times and error rates, helping to identify and address performance issues.

Pricing of Yaak: Free

Pros of Yaak:

• Lightweight and fast
• Cross-platform compatibility
• Excellent for scripting and automation tasks

Cons of Yaak:

• Limited GUI options
• Steeper learning curve for beginners

Why Choosing Yaak: Choosing Yaak provides several advantages for API management and testing. Its comprehensive tools for API design, testing, and monitoring help ensure that APIs are well-designed, thoroughly tested, and perform optimally.

16. HTTPie: Command Line Postman Alternative

HTTPie is a user-friendly command-line HTTP client that aims to make API interaction as simple and intuitive as possible. It provides a syntax that closely resembles the natural language used to describe HTTP requests.

Website: HTTPie

Git: https://github.com/httpie

Key Features of HTTPie:

• Simple Syntax: HTTPie uses a clean and straightforward syntax that makes it easy to construct and send HTTP requests. Its commands are designed to be intuitive and easy to remember.
• Formatted Output: It provides colored and formatted output for HTTP responses, making it easier to read and interpret the results of API requests. The response is displayed in a human-readable format, including headers, status codes, and body content.
• Support for Various HTTP Methods: HTTPie supports all standard HTTP methods such as GET, POST, PUT, DELETE, PATCH, and more, allowing users to interact with APIs in a versatile manner.
• JSON Support: It handles JSON data seamlessly, allowing users to send and receive JSON-formatted data easily. HTTPie can also pretty-print JSON responses for better readability.

Pricing of HTTPie:

HTTPie is open-source and free to use.

Pros of HTTPie:

• Extremely user-friendly syntax
• Lightweight and fast
• Excellent for scripting and automation tasks

Cons of HTTPie:

• Limited GUI options
• Fewer features compared to some GUI-based alternatives

Why Choosing HTTPie: Choosing HTTPie offers several benefits for interacting with APIs and web services. Its user-friendly syntax and formatted output make it easier to construct and read HTTP requests and responses compared to more complex command-line tools.

17. ReadyAPI: Postman Alternative for REST, SOAP and WebSockets

ReadyAPI is a comprehensive API testing and monitoring solution that offers a robust set of features for both functional and non-functional testing. It supports various protocols, including REST, SOAP, and WebSockets.

Website: ReadyAPI

Git: https://github.com/SmartBear/ready-api-plugins

Key Features of ReadyAPI:

• Functional Testing: ReadyAPI offers robust capabilities for creating and executing functional tests for APIs. It supports REST, SOAP, and GraphQL APIs, allowing users to validate API endpoints, request/response formats, and business logic.
• API Security Testing: The platform includes tools for performing security tests on APIs to identify vulnerabilities and ensure that APIs are protected against potential threats and attacks.
• Load Testing: ReadyAPI provides features for load testing APIs, simulating various traffic scenarios to assess API performance and scalability under different loads.
• API Monitoring: It offers continuous monitoring of APIs to track performance, uptime, and reliability. Users can set up alerts and notifications to detect and respond to issues in real-time.

Pricing of ReadyAPI:

ReadyAPI offers various pricing tiers based on the features and scale of usage.

Pros of ReadyAPI:

• Comprehensive testing and monitoring features
• User-friendly interface for non-technical users
• Excellent reporting and analytics capabilities

Cons of ReadyAPI:

• Relatively expensive for individual users
• Steeper learning curve for advanced features

Why Choosing ReadyAPI: Choosing ReadyAPI provides several strategic advantages for API testing and management. Its comprehensive suite of tools ensures thorough testing of API functionality, security, and performance, helping to deliver high-quality and reliable APIs.

18. Hoppscotch: Open Source Postman Alternative that Is Feature Rich

Hoppscotch is a free, open-source API development ecosystem that includes a feature-rich API client, a powerful API request builder, and a minimalistic code editor.

Website: Hoppscotch

Git: https://github.com/hoppscotch/hoppscotch

Key Features of Hoppscotch:

• User-Friendly Interface: Hoppscotch features a clean and intuitive web interface that allows users to easily construct and send API requests. It provides a straightforward way to interact with APIs without requiring extensive configuration.
• Support for Multiple API Methods: The tool supports a range of HTTP methods, including GET, POST, PUT, DELETE, PATCH, and others, enabling users to interact with various API endpoints.
• JSON Handling: Hoppscotch efficiently handles JSON data, allowing users to view and format JSON responses for better readability. It supports sending JSON payloads and viewing formatted responses.
• Environment Management: Users can create and manage different environments with custom variables, making it easier to switch between different API configurations and settings.

Pricing of Hoppscotch: Free

Pros of Hoppscotch:

• Free and open-source
• Constantly evolving with new features
• Excellent for team collaboration

Cons of Hoppscotch:

• Limited testing and monitoring capabilities
• Fewer integrations compared to commercial alternatives

Why Choosing Hoppscotch: Choosing Hoppscotch offers several benefits for API development and testing. Its user-friendly and modern interface simplifies the process of making API requests and interpreting responses. The tool’s support for multiple HTTP methods, JSON handling, and authentication methods provides versatility for various API interactions.

19. Postcode: Simple Postman Alternative

Postcode is an open-source API client designed to provide a simple and efficient way to test and explore APIs. It offers a clean and minimalistic interface while still packing essential features.

Website: Non

Git: https://github.com/achchu/postcodes-api-tests

Key Features of Postcode:

• Request Management: Postcode allows users to easily create, send, and manage API requests. It supports various HTTP methods, including GET, POST, PUT, DELETE, and PATCH.
• Response Handling: The tool provides detailed views of API responses, including headers, status codes, and body content. It formats responses to enhance readability and facilitate debugging.
• Environment Support: Users can define and manage multiple environments with customizable variables, making it easier to switch between different configurations and test scenarios.

Pricing of Postcode: Free

Pros of Postcode:

• Free and open-source
• Minimal learning curve
• Cross-platform compatibility

Cons of Postcode:

• Limited testing and debugging capabilities
• Fewer advanced features compared to commercial alternatives

Why Choosing Postcode: Choosing Postcode provides several advantages for API testing and development. Its intuitive interface and support for various HTTP methods simplify the process of creating and managing API requests.

[Solved] Unable to Get Local Issuer Certificate Error in Postman

Struggling with “Unable to Get Local Issuer Certificate” in Postman indicates a trust issue with the API’s certificate. This article explores solutions like enabling CA certificates in Postman settings or verifying the certificate chain. Get your API calls flowing smoothly again!

Apidog BlogSteven Ang Cheong Seng

20. Firecamp: Collaborative Postman Alternative

Firecamp is a collaborative API development and testing tool designed to streamline the process of API management. It offers a range of features for testing, debugging, and documenting APIs in a user-friendly environment.

Website: Firecamp

Git: https://github.com/firecamp-dev/firecamp

Key Features of Firecamp:

• Multi-Protocol Support: Firecamp supports REST, GraphQL, and WebSocket protocols, providing a versatile platform for various API testing needs.
• Collaborative Workspace: It offers real-time collaboration features, allowing teams to work together on API projects and share test cases, requests, and documentation.
• Environment Management: Users can manage multiple environments with customizable variables to facilitate different testing scenarios.
• Integrated Mock Server: Firecamp includes an integrated mock server to simulate API responses and test client applications before the actual API is implemented.

Pricing of Firecamp:

Firecamp offers a free plan with basic features and paid plans starting at around $49 per user per month for advanced functionality and additional features.

Pros of Firecamp:

• Multi-protocol support
• Strong collaboration features
• Integrated mock server

Cons of Firecamp:

• Some advanced features are limited in the free plan
• May have a learning curve for new users

Why Choosing Firecamp:Firecamp provides a collaborative and versatile environment for API development and testing, supporting multiple protocols and offering features that enhance teamwork and productivity.

21. TestMace: Postman Alternative for API Testing and Management

TestMace is a comprehensive API testing and management tool designed to simplify API testing workflows and enhance test automation capabilities.

• Website: TestMace
• Git: https://github.com/testmace

Key Features of TestMace:

• User-Friendly Interface: TestMace features an intuitive interface for creating and managing API tests with minimal setup.
• Test Automation: It supports automated testing with scheduling capabilities, making it easy to integrate into CI/CD pipelines.
• Detailed Reporting: Users receive detailed reports and analytics on test results, API performance, and potential issues.
• Environment and Data Management: TestMace allows for the management of different environments and test data sets, enhancing testing flexibility.

Pricing of TestMace:

TestMace offers a free plan with basic functionalities and paid plans for advanced features and higher usage limits.

Pros of TestMace:

• Easy-to-use interface
• Strong automation and reporting features
• Flexible environment management

Cons of TestMace:

• May lack some advanced features found in more established tools
• Limited integration options compared to some competitors

Why Choosing TestMace:TestMace simplifies API testing with its user-friendly interface, automation capabilities, and detailed reporting, making it a strong choice for efficient API testing and management.

22. LoadNinja: Postman Alternative for Scalability and Performance

LoadNinja is a performance testing tool designed to help organizations test the scalability and performance of their web applications and APIs. It provides a cloud-based platform that enables users to simulate real-world traffic and analyze application performance under various conditions.

Website: LoadNinja

Git: https://github.com/jvenkit1/LoadNinja

Key Features of LoadNinja:

• Real Browser Testing: LoadNinja utilizes real browsers to simulate user interactions, providing more accurate performance results compared to headless browsers.
• Scalability Testing: It allows users to test how their applications handle different levels of traffic, including large-scale loads, to identify performance bottlenecks.
• Scriptless Test Creation: The tool offers a scriptless approach to test creation, enabling users to build tests through a visual interface without writing code.
• Real-Time Analytics: LoadNinja provides real-time performance analytics, including response times, throughput, and error rates, to help users understand how their applications perform under load.
• Cloud-Based Execution: Tests are executed in the cloud, allowing for scalability and flexibility without the need for on-premises infrastructure.

Pricing of LoadNinja:

LoadNinja offers customized pricing based on the specific needs of the organization.

Pros of LoadNinja:

• Real browser testing for accurate results
• Scalable and cloud-based performance testing
• Scriptless test creation for ease of use
• Real-time analytics for immediate insights

Cons of LoadNinja:

• Pricing may be higher compared to some other performance testing tools
• Requires an internet connection for cloud-based execution

Why Choosing LoadNinja: Choosing LoadNinja provides a comprehensive solution for performance testing with real browser interactions, scriptless test creation, and real-time analytics. Its cloud-based execution and scalability make it a strong choice for organizations looking to ensure their applications can handle varying levels of traffic and perform optimally under load.

23. Airborne: Ruby-based Postman Alternative

Airborne is a Ruby-based API testing framework designed specifically for testing REST APIs. It is a lightweight, code-centric tool that enables developers to write tests in a simple and intuitive manner using Ruby syntax. Airborne is ideal for teams already using Ruby in their development processes and looking for an API testing solution integrated with their codebase.

• Website: Non
• Git: https://github.com/brooklynDev/airborne

Key Features of Airborne:

• Ruby Integration: Airborne is fully integrated with Ruby, making it easy for Ruby developers to write and execute API tests directly within their existing projects.
• RSpec Syntax: The tool uses the popular RSpec testing framework for writing and structuring tests, providing a familiar environment for Ruby developers.
• Simple and Clean Syntax: Airborne offers a clean and simple syntax, making it easy to write concise and readable test cases for REST APIs.
• Support for JSON and XML: The framework supports testing APIs that return responses in both JSON and XML formats, allowing users to validate a variety of data structures.
• Customizable Assertions: Airborne enables users to define custom assertions for verifying API responses, enhancing the flexibility of the testing process.

Pricing of Airborne:

Airborne is an open-source tool and is available for free.

Pros of Airborne:

• Tight integration with Ruby and RSpec
• Simple and readable syntax for test writing
• Free and open-source
• Customizable assertions for flexible testing

Cons of Airborne:

• Limited to Ruby-based environments
• Lacks a graphical user interface (GUI)
• Not suitable for teams unfamiliar with Ruby

Why Choosing Airborne: Airborne is an excellent choice for Ruby developers who need a lightweight and code-centric API testing framework. Its integration with RSpec, clean syntax, and customizable assertions make it an ideal tool for teams already working in Ruby environments and looking to streamline their API testing processes.

24. curlx: Command Line Postman Alternative

Curlx is a command-line tool for making HTTP requests and interacting with APIs, designed to offer an enhanced experience compared to the traditional curl utility.

• Website: curlx
• Git: https://github.com/shivkanthb/curlx

Key Features of curlx:

• Enhanced Syntax: curlx provides an enhanced syntax that simplifies making HTTP requests compared to standard curl.
• Formatted Output: It includes features for formatting and color-coding HTTP responses, improving readability.
• Support for Multiple Methods: curlx supports various HTTP methods and allows users to easily specify headers and request parameters.
• Cross-Platform: Available on multiple operating systems, including Windows, macOS, and Linux.

Pricing of curlx:

Curlx is open-source and free to use.

Pros of curlx:

• Enhanced syntax and improved readability
• Cross-platform availability
• Free and open-source

Cons of curlx:

• Limited GUI options
• Fewer features compared to some GUI-based alternatives

Why Choosing curlx:curlx enhances the traditional curl experience with a more user-friendly syntax and improved output formatting, making it a useful tool for command-line API interactions.

25. RecipeUIL Postman Alternative that Is Better than Postman

RecipeUI is an API testing tool designed to provide a streamlined and efficient interface for managing and executing API requests.

• Website: RecipeUI
• Git: https://github.com/RecipeUI/RecipeUI

Key Features of RecipeUI:

• Intuitive Interface: RecipeUI offers an intuitive and user-friendly interface for crafting and managing API requests.
• Request Organization: It allows users to organize requests into collections, making it easier to manage and reuse them.
• Customizable Environments: Users can set up and manage multiple environments with custom variables for different testing scenarios.
• Automated Testing: RecipeUI supports test automation with scheduling capabilities and integration with CI/CD workflows.

Pricing of RecipeUI: Free

Pros of RecipeUI:

• User-friendly and intuitive interface
• Request organization and environment management
• Supports automation and integration

Cons of RecipeUI:

• Advanced features may be limited in the free plan
• Less known compared to some established tools

Why Choosing RecipeUI: RecipeUI offers a user-friendly interface and strong features for organizing requests, managing environments, and automating tests, making it a practical choice for API testing.

26. httpYac: Modern, Simple Postman Alternative

httpYac is a modern HTTP client designed to provide a simple and efficient way to interact with APIs through a command-line interface.

• Website: httpYac
• Git: https://github.com/AnWeber/httpyac

Key Features of httpYac:

• Command-Line Interface: httpYac offers a streamlined command-line interface for making HTTP requests and managing responses.
• Formatted Responses: It provides formatted and color-coded responses to enhance readability.
• Support for Various Methods: httpYac supports all standard HTTP methods, including GET, POST, PUT, DELETE, and PATCH.
• Configuration Management: Users can manage configurations and environment variables to streamline testing processes.

Pricing of httpYac:

httpYac is open-source and free to use.

Pros of httpYac:

• Simple and efficient command-line interface
• Formatted and readable responses
• Free and open-source

Cons of httpYac:

• Limited GUI features
• Less suitable for non-technical users

Why Choosing httpYac:httpYac provides a straightforward command-line interface for efficient API testing and interaction, with formatted responses and configuration management for improved usability.

27. JMeter: Postman Alternative for Load Testing

JMeter is an open-source performance testing tool designed for load testing and measuring the performance of various services, including APIs.

• Website: JMeter
• Git: https://github.com/apache/jmeter

Key Features of JMeter:

• Load Testing: JMeter is renowned for its ability to perform load testing on APIs and web applications, simulating various traffic scenarios.
• Comprehensive Reporting: It provides detailed reports and metrics on API performance, response times, and throughput.
• Support for Multiple Protocols: JMeter supports not only HTTP/HTTPS but also other protocols such as FTP, JDBC, and JMS.
• Extensibility: The tool offers plugins and extensions to enhance its functionality and adapt to different testing requirements.

Pricing of JMeter:

JMeter is open-source and free to use.

Pros of JMeter:

• Powerful load testing capabilities
• Detailed performance reporting
• Supports multiple protocols

Cons of JMeter:

• Can be complex to set up and use
• Requires a significant amount of resources for large-scale tests

Why Choosing JMeter:JMeter is a powerful tool for performance and load testing, providing extensive reporting and support for multiple protocols, making it a robust choice for comprehensive testing scenarios.

28. TestSigma: Postman Alternative for Unified API Testing

TestSigma is a test automation platform that provides a unified approach to API testing, functional testing, and test management.

• Website: TestSigma
• Git: https://github.com/testsigmahq/testsigma

Key Features of TestSigma:

• Unified Testing Platform: TestSigma offers a unified platform for managing API tests, functional tests, and test automation.
• User-Friendly Test Creation: It features a user-friendly interface for creating and managing tests without extensive coding.
• Automated Test Execution: The platform supports automated test execution and integrates with CI/CD pipelines for continuous testing.
• Detailed Reporting: Users receive detailed reports and analytics on test results and performance.

Pricing of TestSigma:

You need to contact sales for pricing.

Pros of TestSigma:

• Unified testing platform
• User-friendly test creation
• Integration with CI/CD

Cons of TestSigma:

• Higher cost for advanced features
• Learning curve for new users

Why Choosing TestSigma:TestSigma provides a comprehensive and unified platform for API and functional testing, with user-friendly test creation and robust automation capabilities, making it a strong choice for organizations seeking integrated test management.

29. Assertible: Postman Alternative for Simple API Testing with Test Cases

Assertible is a modern API testing tool focused on simplifying the process of API testing and ensuring reliable and repeatable test cases.

• Website: Assertible
• Git: https://github.com/assertible

Key Features of Assertible:

• Easy Test Creation: Assertible allows users to create and manage API tests with minimal setup, using a straightforward interface.
• Automated Testing: It supports automated test execution with scheduling and integration with CI/CD workflows.
• Detailed Assertions: The tool provides detailed assertions and checks to ensure API responses meet expected criteria.
• Collaboration and Sharing: Assertible includes features for sharing test cases and collaborating with team members.

Pricing of Assertible:

Assertible offers a free plan with basic functionalities and paid plans for advanced features and additional users.

Pros of Assertible:

• Simple and intuitive test creation
• Automation and integration support
• Detailed assertions

Cons of Assertible:

• Limited features in the free plan
• Higher cost for premium plans

Why Choosing Assertible:Assertible simplifies API testing with its easy-to-use interface and automation capabilities, providing detailed assertions and collaboration features that make it a practical choice for teams seeking reliable and repeatable API tests.

30. Tricentis Tosca: Enterprise Grade Postman Alternative

Tricentis Tosca is an enterprise-grade test automation tool that provides comprehensive solutions for API testing, functional testing, and test management.

Website: Tricentis Tosca

Git: Tricentis Tosca GitHub

Key Features of Tricentis Tosca:

• Comprehensive Test Automation: Tricentis Tosca offers robust test automation capabilities for APIs, functional tests, and end-to-end testing.
• Model-Based Testing: The tool uses a model-based testing approach to streamline test creation and maintenance.
• Integration Capabilities: Tosca integrates with various CI/CD tools and other development platforms to support continuous testing and deployment.
• Advanced Reporting and Analytics: It provides detailed reporting and analytics to track test results and performance.

Pricing of Tricentis Tosca:

Tricentis Tosca offers customized pricing based on the needs of the organization. Pricing typically involves a subscription model, and interested users should contact Tricentis for a quote.

Pros of Tricentis Tosca:

• Comprehensive test automation
• Model-based testing approach
• Strong integration capabilities

Cons of Tricentis Tosca:

• Higher cost for enterprise features
• Requires significant setup and configuration

Why Choosing Tricentis Tosca:Tricentis Tosca provides a powerful and comprehensive solution for test automation, offering model-based testing, extensive integration options, and advanced reporting, making it a strong choice for enterprises with complex testing needs.

Conclusion

Postman is a popular API development tool, but there are plenty of free and open-source alternatives on the market. Whether you're looking for a tool with a sleek interface, code generation capabilities, or cloud-based testing, there's an API testing and development tool out there for you. Apidog is the best ideal Postman alternative tool for you. Try it now.

FAQs:

1. What is the best alternative for Postman?

The best Postman alternative depends on your needs. If you are finding an all-in-one API development tool, then Apidog is the best free tool on the market that you will need only for streamlining the whole API development process.

2. Is Postman no longer free?

Postman still offers a free plan in 2025 with basic features. However, more advanced features such as collaboration tools, increased request limits, and extended API usage require a paid subscription.

3. How to check API without Postman?

You can check APIs using alternatives like Apidog(online and desktop version available), Insomnia, etc. You can also use terminal commands or programming languages like Python and JavaScript to interact with APIs.

4. Is Insomnia better than Postman?

Insomnia may be better than Postman for users seeking a minimalist, lightweight API client with a more modern interface. However, Postman offers more advanced collaboration and testing features for large teams. The choice depends on your needs. If you are finding a better alternative than Postman, I recommend giving Apidog a Try.

5. Why not use Postman?

Some users avoid Postman due to its increasing complexity, higher costs for premium features, and performance issues when handling larger projects. Alternatives like Apidog or Thunder Client are preferred for a more streamlined experience.

6. Is Postman owned by Microsoft?

No, Postman is not owned by Microsoft. It is developed and owned by Postman. Inc., a private company.

7. Why are people moving away from Postman?

People are moving away from Postman due to the high cost of premium features, resource-intensive nature, and the availability of lightweight alternatives like Apidog, which offer a faster, simpler experience.

8. Is Postman outdated?

Not for now! Some users feel its interface has become cluttered and slower compared to newer, more focused tools, like Apidog. So it is possible that it will become outdated. Be sure you have learnt new popular API test tools to keep your job!

9. Is Postman free in 2025?

Yes, Postman offers a free plan in 2025, which provides essential API testing functionalities. However, many advanced features require a paid subscription. So people are starting moving to more advanced and affordablealternative, like Apidog.