Postman is popular, but many developers are exploring alternatives for lightweight testing, automation, or enterprise workflows. Here’s a curated list of top tools you can use in 2025.
🖥️ 1. Insomnia
Type: GUI | Platforms: Mac, Windows, Linux | Open Source
Highlights:
- Supports REST, GraphQL, gRPC
- Clean, intuitive interface
- Design-first workflows: variables, environments, Git sync
Ideal for developers who want a visually clean tool with advanced workflow support.
🌟 2. Hoppscotch (formerly Postwoman)
Type: Browser-based | Platforms: Web | Open Source
Highlights:
- Minimal setup, no installation needed
- Supports REST, GraphQL, WebSocket
- Lightweight and fast
Perfect for developers wanting a no-installation, fast API client.
⚡ 3. Thunder Client
Type: VS Code Extension | Platforms: VS Code | Open Source
Highlights:
- Test APIs without leaving VS Code
- Collections stored as JSON for version control
- Lightweight and simple
Ideal for developers who prefer editor-integrated tools.
💻 4. HTTPie
Type: CLI / GUI | Platforms: Cross-platform | Open Source
Highlights:
- Command-line HTTP client with human-friendly syntax
- GUI available for scripting or automation integration
- Ideal for automation and CI/CD pipelines
Perfect for CLI enthusiasts and automation workflows.
🧪 5. SoapUI / ReadyAPI
Type: GUI | Platforms: Cross-platform | Open Source / Commercial
Highlights:
- SoapUI: free, supports REST and SOAP
- ReadyAPI: enterprise-level with load testing, virtualization, advanced features
- Great for robust testing and enterprise needs
Suited for teams needing full-featured API testing solutions.
🚀 6. Katalon Studio
Type: GUI | Platforms: Mac, Windows, Linux | Free / Commercial
Highlights:
- Supports web, mobile, desktop, API testing
- Designed for automation, CI/CD, and data-driven tests
All-in-one solution for teams wanting cross-platform testing.
☕ 7. REST-Assured
Type: Library (Java) | Platforms: JVM | Open Source
Highlights:
- Java-based API testing library
- Easily integrates with CI pipelines or automation frameworks
Best for Java developers embedding tests in code.
📖 8. Karate DSL
Type: Library (Java/Groovy) | Platforms: JVM | Open Source
Highlights:
- BDD-style syntax for readable and maintainable tests
- Supports REST, GraphQL, mocks, performance testing
Great for BDD-focused testing workflows.
🏢 9. Parasoft SOAtest
Type: GUI | Platforms: Cross-platform | Commercial
Highlights:
- Enterprise-grade tool for SOAP, REST, etc.
- Functional testing, security testing, mocking, performance testing
Perfect for large organizations needing full-featured enterprise solutions.
🎯 10. Apidog
Type: GUI | Platforms: Web / Cross-platform | Commercial / Affordable
Highlights:
- Combines API design and testing
- Supports REST, GraphQL, WebSocket, gRPC
- Cheaper than other enterprise tools
Ideal for startups or small teams needing both design + testing in one platform.
Main Article : https://medium.com/@dulthiwanka2015/top-postman-alternatives-for-api-testing-in-2025-a860b3eca7d0?postPublishedType=initial
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