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66 API testing apps

sorted A to Z · page 1 of 2

A–ZCheapestMost established
Narrow byFree plan50Open source25Self-hostable17
  1. 1AdalWebhook delivery you can trust$9–$29/moFree plan
  2. 2Advanced REST ClientAn API consumption tool for developers
  3. 3API DashTest, Visualize & Integrate APIs in a Dash ⚡️Free planOpen source
  4. 4API Test BaseTest what your API really didFree
  5. 5ApiArkNo Login. No Cloud. No Bloat.FreeOpen source
  6. 6APIBuilderHQDescribe the API you need. We build the request.From $12/moFree plan
  7. 7ApidogREAL API Design-first Development Platform. Design. Debug. Test. Document. Mock. Build APIs Faster & Together.$9–$27/user/moFree planSelf-hostable
  8. 8ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  9. 9AtrahasisAPI Client and Development Platform. Flexible by design.$12–$39/moFree plan
  10. 10BrunoThe Git-Native API Client$6–$11/moFree planOpen source
  11. 11Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  12. 12CopiioAIAI-Powered Patent Intelligence
  13. 13curlcommand line tool and library for transferring data with URLsFree planOpen source
  14. 14DotMockRun the whole loop. Break nothing real.$12–$49/moFree plan
  15. 15FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  16. 16FlareCanaryKnow when APIs change before your code breaks$19–$499/moFree plan
  17. 17FunctionizeThe Quality Layer for AI-Written CodeFrom $20/moFree trialSelf-hostable
  18. 18GetAPIDead Simple REST ClientOne-timeFree trial
  19. 19GetItSimple HTTP request applicationOpen source
  20. 20Header EditorFrom $3.99/moFree plan
  21. 21HoppscotchOpen source API development ecosystemOpen source
  22. 22HTTPie for TerminalAn open-source API testing client for open minds.Open source
  23. 23HttpMasterMaster HTTP Testing and DebuggingFree
  24. 24HumlixGenerate tests for your web APIs in minutes.
  25. 25HurlRun and Test HTTP RequestsOpen source
  26. 26InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  27. 27InvictiAppSec with Zero NoiseOn requestFree trialSelf-hostable
  28. 28JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  29. 29JSON Encoder & DecoderFormat, Validate & EscapeFree
  30. 30k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  31. 31Katalon StudioNo-code, low-code, and full-code automation for web, API, mobile, and desktop.$59–$229/user/mo30-day trial
  32. 32KeployAI-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
  33. 33KeyRunnerTurn existing APIs into governed AI tools in under 5 minutes. Give agents capability, not credentials.From $49/user/moFree planSelf-hostable
  34. 34KreyaThe cross-platform API testing tool.Free plan
  35. 35KushoAIThe reliability layer for modern softwareFree planSelf-hostable
  36. 36Lama2Free, lightweight & collaborative API client based on plain-text and git.FreeOpen source
  37. 37LoadmillComputer-Using Agents for Mobile Testing$208–$1250/moFree plan
  38. 38MilkmanA Request/Response WorkbenchFreeOpen source
  39. 39MimicryFrictionless Mock API Engine.Free
  40. 40MockFlowMock APIs in seconds. No account required.Free planSelf-hostable
  41. 41MocklantisMock APIs. Build faster.Free
  42. 42MockServerBuild faster, mock smarter.$10–$12/moFree plan
  43. 43NativeRestNative REST API client for Windows, macOS and LinuxOne-time7-day trialSelf-hostable
  44. 44OlympSSH CommanderThe native SSH command center for developers and self-hosters who run real servers.Free plan
  45. 45Packet Capture ProAdvanced Cross-Platform Packet Capture ToolFree plan
  46. 46PaziWatch your idea come to life$50–$200/moFree plan
  47. 47PostmanThe AI-native API Platform$9–$49/moFree plan
  48. 48Postmate ClientPrivacy-First Postman Alternative for VS CodeFree