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21 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