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25 API testing apps

sorted A to Z

A–ZCheapestMost established
Narrow byFree plan50Open source25Self-hostable17
  1. 1API DashTest, Visualize & Integrate APIs in a Dash ⚡️Free planOpen source
  2. 2ApiArkNo Login. No Cloud. No Bloat.FreeOpen source
  3. 3ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  4. 4BrunoThe Git-Native API Client$6–$11/moFree planOpen source
  5. 5Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  6. 6curlcommand line tool and library for transferring data with URLsFree planOpen source
  7. 7FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  8. 8GetItSimple HTTP request applicationOpen source
  9. 9HoppscotchOpen source API development ecosystemOpen source
  10. 10HTTPie for TerminalAn open-source API testing client for open minds.Open source
  11. 11HurlRun and Test HTTP RequestsOpen source
  12. 12InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  13. 13JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  14. 14k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  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. 16Lama2Free, lightweight & collaborative API client based on plain-text and git.FreeOpen source
  17. 17MilkmanA Request/Response WorkbenchFreeOpen source
  18. 18SeedmancerRecreate Any Test State in SecondsFrom $5/moFree planOpen sourceSelf-hostable
  19. 19SoapUIThe simplest and easiest way to begin your API testing journeyFree planOpen source
  20. 20Step CIAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable
  21. 21TestSpriteAgentic testing for AI-native teams.$19–$69/moFree planOpen source
  22. 22Voiden.mdThe Offline, Git-Native API WorkspaceFreeOpen source
  23. 23WebMaestroOpen Source REST API ClientFree planOpen source
  24. 24YaakThe local-first API client$6.58–$12.42/moFree planOpen source
  25. 25ZeroWebToolsSimple, Private Web Tools Right in Your Browser.FreeOpen source