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20 free Postman alternatives

ranked by how closely each fits what Postman does · Postman itself has a free plan

Narrow byFree plan20Open source10Self-hostable6
  1. 1ApidogREAL API Design-first Development Platform. Design. Debug. Test. Document. Mock. Build APIs Faster & Together.$9–$27/user/moFree planSelf-hostable
  2. 2InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  3. 3FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  4. 4BrunoThe Git-Native API Client$6–$11/moFree planOpen source
  5. 5WebMaestroOpen Source REST API ClientFree planOpen source
  6. 6AtrahasisAPI Client and Development Platform. Flexible by design.$12–$39/moFree plan
  7. 7KreyaThe cross-platform API testing tool.Free plan
  8. 8Zunoy MockAPIGenerate a production-quality mock API instantly—prototype and develop faster.Free plan
  9. 9ApiArkNo Login. No Cloud. No Bloat.FreeOpen source
  10. 10KeyRunnerTurn existing APIs into governed AI tools in under 5 minutes. Give agents capability, not credentials.From $49/user/moFree planSelf-hostable
  11. 11API Test BaseTest what your API really didFree
  12. 12SoapUIThe simplest and easiest way to begin your API testing journeyFree planOpen source
  13. 13HttpMasterMaster HTTP Testing and DebuggingFree
  14. 14MockServerBuild faster, mock smarter.$10–$12/moFree plan
  15. 15APIBuilderHQDescribe the API you need. We build the request.From $12/moFree plan
  16. 16DotMockRun the whole loop. Break nothing real.$12–$49/moFree plan
  17. 17KeployAI-powered testing platform: generate tests, mocks, and sandboxes from real API traffic. Any language. 90% coverage in minutes — no code changes.From $19/user/moFree planOpen sourceSelf-hostable
  18. 18Step CIAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable
  19. 19Postmate ClientPrivacy-First Postman Alternative for VS CodeFree
  20. 20API DashTest, Visualize & Integrate APIs in a Dash ⚡️Free planOpen source

Need something more specific than “like Postman”? Describe what you need and AppClap ranks the catalog for it.