soapUI is a popular open-source API testing tool that allows users to test SOAP and REST APIs.
Best Bruno Alternatives ranked by AI · updated Aug 2026
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Bruno is an open-source desktop API client that stores request collections as plain-text files in Git-friendly folders. It is designed for developers who prioritize local control, version control, and offline use.
Top 6 Bruno alternatives
Apache JMeter is an open-source testing tool used for analyzing and measuring the performance of a variety of services.
Postman is a collaboration platform for API development used by millions of developers.
Free with paid plans available
Karate is an open-source framework for API testing, UI automation, performance testing, and mocks using a readable domain-specific language. It is aimed...
Pros
- Combines API, UI, performance, and mock testing in one framework
- Readable syntax requires less Java boilerplate than REST Assured
- Includes built-in parallel execution, reporting, assertions, and data-driven testing
Cons
- Smaller ecosystem and community than Postman or JMeter
- DSL-specific conventions can take time to learn
- Less suitable than Pact for dedicated consumer-driven contract testing
Free; enterprise support and features available
HTTPie is a command-line HTTP client that is user-friendly and intuitive.
Milkman is a free, open-source desktop API client for developers who need to create, send, and organize HTTP requests. Its plugin architecture...
Pros
- Free and open source without a required cloud account
- Extensible plugin architecture supports more than basic REST requests
- Local-first workflow is useful for privacy-sensitive development
Cons
- Smaller ecosystem and community than Postman or Insomnia
- Less polished collaboration and team management than commercial clients
- Desktop interface is less familiar to many developers than browser-first tools
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