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50 API testing apps

most established first · page 1 of 2

A–ZCheapestMost established
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  1. 1curlcommand line tool and library for transferring data with URLsFree planOpen source
  2. 2PostmanThe AI-native API Platform$9–$49/moFree plan
  3. 3InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  4. 4k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  5. 5ApidogREAL API Design-first Development Platform. Design. Debug. Test. Document. Mock. Build APIs Faster & Together.$9–$27/user/moFree planSelf-hostable
  6. 6BrunoThe Git-Native API Client$6–$11/moFree planOpen source
  7. 7SoapUIThe simplest and easiest way to begin your API testing journeyFree planOpen source
  8. 8RapidAPI for MacThe most advanced API tool for MacFree planSelf-hostable
  9. 9Lama2Free, lightweight & collaborative API client based on plain-text and git.FreeOpen source
  10. 10KeployAI-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
  11. 11LoadmillComputer-Using Agents for Mobile Testing$208–$1250/moFree plan
  12. 12TestSpriteAgentic testing for AI-native teams.$19–$69/moFree planOpen source
  13. 13AdalWebhook delivery you can trust$9–$29/moFree plan
  14. 14API DashTest, Visualize & Integrate APIs in a Dash ⚡️Free planOpen source
  15. 15API Test BaseTest what your API really didFree
  16. 16ApiArkNo Login. No Cloud. No Bloat.FreeOpen source
  17. 17APIBuilderHQDescribe the API you need. We build the request.From $12/moFree plan
  18. 18ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  19. 19AtrahasisAPI Client and Development Platform. Flexible by design.$12–$39/moFree plan
  20. 20Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  21. 21DotMockRun the whole loop. Break nothing real.$12–$49/moFree plan
  22. 22FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  23. 23FlareCanaryKnow when APIs change before your code breaks$19–$499/moFree plan
  24. 24Header EditorFrom $3.99/moFree plan
  25. 25HttpMasterMaster HTTP Testing and DebuggingFree
  26. 26JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  27. 27JSON Encoder & DecoderFormat, Validate & EscapeFree
  28. 28KeyRunnerTurn existing APIs into governed AI tools in under 5 minutes. Give agents capability, not credentials.From $49/user/moFree planSelf-hostable
  29. 29KreyaThe cross-platform API testing tool.Free plan
  30. 30KushoAIThe reliability layer for modern softwareFree planSelf-hostable
  31. 31MilkmanA Request/Response WorkbenchFreeOpen source
  32. 32MimicryFrictionless Mock API Engine.Free
  33. 33MockFlowMock APIs in seconds. No account required.Free planSelf-hostable
  34. 34MocklantisMock APIs. Build faster.Free
  35. 35MockServerBuild faster, mock smarter.$10–$12/moFree plan
  36. 36OlympSSH CommanderThe native SSH command center for developers and self-hosters who run real servers.Free plan
  37. 37Packet Capture ProAdvanced Cross-Platform Packet Capture ToolFree plan
  38. 38PaziWatch your idea come to life$50–$200/moFree plan
  39. 39Postmate ClientPrivacy-First Postman Alternative for VS CodeFree
  40. 40ProxyKitKnow when it's down. Before your users do.From $9/moFree plan
  41. 41Qodex.aiAI writes your code. Qodex makes sure it works.Free plan
  42. 42ReqableReqable = Fiddler + Charles + PostmanFrom $4.16/moFree plan
  43. 43SeedmancerRecreate Any Test State in SecondsFrom $5/moFree planOpen sourceSelf-hostable
  44. 44Step CIAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable
  45. 45Thunder ClientThunder Client is a hand-crafted lightweight Rest API Client extension for Visual Studio Code$3–$16/moFree plan
  46. 46Voiden.mdThe Offline, Git-Native API WorkspaceFreeOpen source
  47. 47WebMaestroOpen Source REST API ClientFree planOpen source
  48. 48YaakThe local-first API client$6.58–$12.42/moFree planOpen source