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25 API testing apps

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A–ZCheapestMost established
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  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. 8InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  9. 9JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  10. 10k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  11. 11KeployAI-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
  12. 12Lama2Free, lightweight & collaborative API client based on plain-text and git.FreeOpen source
  13. 13MilkmanA Request/Response WorkbenchFreeOpen source
  14. 14SeedmancerRecreate Any Test State in SecondsFrom $5/moFree planOpen sourceSelf-hostable
  15. 15SoapUIThe simplest and easiest way to begin your API testing journeyFree planOpen source
  16. 16Step CIAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable
  17. 17TestSpriteAgentic testing for AI-native teams.$19–$69/moFree planOpen source
  18. 18Voiden.mdThe Offline, Git-Native API WorkspaceFreeOpen source
  19. 19WebMaestroOpen Source REST API ClientFree planOpen source
  20. 20YaakThe local-first API client$6.58–$12.42/moFree planOpen source
  21. 21ZeroWebToolsSimple, Private Web Tools Right in Your Browser.FreeOpen source
  22. 22GetItSimple HTTP request applicationOpen source
  23. 23HoppscotchOpen source API development ecosystemOpen source
  24. 24HTTPie for TerminalAn open-source API testing client for open minds.Open source
  25. 25HurlRun and Test HTTP RequestsOpen source