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66 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. 3Katalon StudioNo-code, low-code, and full-code automation for web, API, mobile, and desktop.$59–$229/user/mo30-day trial
  4. 4InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  5. 5InvictiAppSec with Zero NoiseOn requestFree trialSelf-hostable
  6. 6k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  7. 7ApidogREAL API Design-first Development Platform. Design. Debug. Test. Document. Mock. Build APIs Faster & Together.$9–$27/user/moFree planSelf-hostable
  8. 8BrunoThe Git-Native API Client$6–$11/moFree planOpen source
  9. 9HTTPie for TerminalAn open-source API testing client for open minds.Open source
  10. 10SoapUIThe simplest and easiest way to begin your API testing journeyFree planOpen source
  11. 11HoppscotchOpen source API development ecosystemOpen source
  12. 12FunctionizeThe Quality Layer for AI-Written CodeFrom $20/moFree trialSelf-hostable
  13. 13RapidAPI for MacThe most advanced API tool for MacFree planSelf-hostable
  14. 14Lama2Free, lightweight & collaborative API client based on plain-text and git.FreeOpen source
  15. 15KeployAI-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
  16. 16LoadmillComputer-Using Agents for Mobile Testing$208–$1250/moFree plan
  17. 17TestSpriteAgentic testing for AI-native teams.$19–$69/moFree planOpen source
  18. 18AdalWebhook delivery you can trust$9–$29/moFree plan
  19. 19Advanced REST ClientAn API consumption tool for developers
  20. 20API DashTest, Visualize & Integrate APIs in a Dash ⚡️Free planOpen source
  21. 21API Test BaseTest what your API really didFree
  22. 22ApiArkNo Login. No Cloud. No Bloat.FreeOpen source
  23. 23APIBuilderHQDescribe the API you need. We build the request.From $12/moFree plan
  24. 24ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  25. 25AtrahasisAPI Client and Development Platform. Flexible by design.$12–$39/moFree plan
  26. 26Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  27. 27CopiioAIAI-Powered Patent Intelligence
  28. 28DotMockRun the whole loop. Break nothing real.$12–$49/moFree plan
  29. 29FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  30. 30FlareCanaryKnow when APIs change before your code breaks$19–$499/moFree plan
  31. 31GetAPIDead Simple REST ClientOne-timeFree trial
  32. 32GetItSimple HTTP request applicationOpen source
  33. 33Header EditorFrom $3.99/moFree plan
  34. 34HttpMasterMaster HTTP Testing and DebuggingFree
  35. 35HumlixGenerate tests for your web APIs in minutes.
  36. 36HurlRun and Test HTTP RequestsOpen source
  37. 37JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  38. 38JSON Encoder & DecoderFormat, Validate & EscapeFree
  39. 39KeyRunnerTurn existing APIs into governed AI tools in under 5 minutes. Give agents capability, not credentials.From $49/user/moFree planSelf-hostable
  40. 40KreyaThe cross-platform API testing tool.Free plan
  41. 41KushoAIThe reliability layer for modern softwareFree planSelf-hostable
  42. 42MilkmanA Request/Response WorkbenchFreeOpen source
  43. 43MimicryFrictionless Mock API Engine.Free
  44. 44MockFlowMock APIs in seconds. No account required.Free planSelf-hostable
  45. 45MocklantisMock APIs. Build faster.Free
  46. 46MockServerBuild faster, mock smarter.$10–$12/moFree plan
  47. 47NativeRestNative REST API client for Windows, macOS and LinuxOne-time7-day trialSelf-hostable
  48. 48OlympSSH CommanderThe native SSH command center for developers and self-hosters who run real servers.Free plan