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25 API testing apps

most established first

A–ZCheapestMost established
Narrow byFree plan50Open source25Self-hostable17
  1. 1curlcommand line tool and library for transferring data with URLsFree planOpen source
  2. 2InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  3. 3k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  4. 4BrunoThe Git-Native API Client$6–$11/moFree planOpen source
  5. 5HTTPie for TerminalAn open-source API testing client for open minds.Open source
  6. 6SoapUIThe simplest and easiest way to begin your API testing journeyFree planOpen source
  7. 7HoppscotchOpen source API development ecosystemOpen source
  8. 8Lama2Free, lightweight & collaborative API client based on plain-text and git.FreeOpen source
  9. 9KeployAI-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
  10. 10TestSpriteAgentic testing for AI-native teams.$19–$69/moFree planOpen source
  11. 11API DashTest, Visualize & Integrate APIs in a Dash ⚡️Free planOpen source
  12. 12ApiArkNo Login. No Cloud. No Bloat.FreeOpen source
  13. 13ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  14. 14Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  15. 15FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  16. 16GetItSimple HTTP request applicationOpen source
  17. 17HurlRun and Test HTTP RequestsOpen source
  18. 18JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  19. 19MilkmanA Request/Response WorkbenchFreeOpen source
  20. 20SeedmancerRecreate Any Test State in SecondsFrom $5/moFree planOpen sourceSelf-hostable
  21. 21Step CIAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable
  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