Skip to content
AppClap

17 API testing apps

sorted A to Z

A–ZCheapestMost established
Narrow byFree plan50Open source25Self-hostable17
  1. 1ApidogREAL API Design-first Development Platform. Design. Debug. Test. Document. Mock. Build APIs Faster & Together.$9–$27/user/moFree planSelf-hostable
  2. 2ApimanFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
  3. 3Cerberus TestingThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
  4. 4FirecampGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
  5. 5FunctionizeThe Quality Layer for AI-Written CodeFrom $20/moFree trialSelf-hostable
  6. 6InsomniaThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
  7. 7InvictiAppSec with Zero NoiseOn requestFree trialSelf-hostable
  8. 8JikkenEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
  9. 9k6Load testing for engineering teamsFree planOpen sourceSelf-hostable
  10. 10KeployAI-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
  11. 11KeyRunnerTurn existing APIs into governed AI tools in under 5 minutes. Give agents capability, not credentials.From $49/user/moFree planSelf-hostable
  12. 12KushoAIThe reliability layer for modern softwareFree planSelf-hostable
  13. 13MockFlowMock APIs in seconds. No account required.Free planSelf-hostable
  14. 14NativeRestNative REST API client for Windows, macOS and LinuxOne-time7-day trialSelf-hostable
  15. 15RapidAPI for MacThe most advanced API tool for MacFree planSelf-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