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17 API testing apps

most established first

A–ZCheapestMost established
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  1. 1InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  2. 2InvictiAppSec with Zero NoiseOn requestFree trialSelf-hostable
  3. 3k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  4. 4ApidogREAL API Design-first Development Platform. Design. Debug. Test. Document. Mock. Build APIs Faster & Together.$9–$27/user/moFree planSelf-hostable
  5. 5FunctionizeThe Quality Layer for AI-Written CodeFrom $20/moFree trialSelf-hostable
  6. 6RapidAPI for MacThe most advanced API tool for MacFree planSelf-hostable
  7. 7KeployAI-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
  8. 8ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  9. 9Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  10. 10FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  11. 11JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  12. 12KeyRunnerTurn existing APIs into governed AI tools in under 5 minutes. Give agents capability, not credentials.From $49/user/moFree planSelf-hostable
  13. 13KushoAIThe reliability layer for modern softwareFree planSelf-hostable
  14. 14MockFlowMock APIs in seconds. No account required.Free planSelf-hostable
  15. 15NativeRestNative REST API client for Windows, macOS and LinuxOne-time7-day trialSelf-hostable
  16. 16SeedmancerRecreate Any Test State in SecondsFrom $5/moFree planOpen sourceSelf-hostable
  17. 17Step CIAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable