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9 API testing apps

most established first

A–Z Cheapest Most established

Narrow byFree plan50 Open source25 Self-hostable17

1Insomniainsomnia.restThe Collaborative API Development Platform$12–$45/user/moFree planOpen sourceSelf-hostable
2k6k6.ioLoad testing for engineering teamsFree planOpen sourceSelf-hostable
3Keploykeploy.ioAI-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
4Apimanapiman.ioFlexible Open Source API ManagementFree planOpen sourceSelf-hostable
5Cerberus Testingcerberus-testing.orgThe Open Source Test Automation PlatformFree planOpen sourceSelf-hostable
6Firecampfirecamp.ioGet instant API playgrounds to test Rest, GraphQL, WebSocket and SocketIO APIsFrom $59/moFree planOpen sourceSelf-hostable
7Jikkenjikken.ioEmpowering developers through tools that make sense$8.5–$85/moFree planOpen sourceSelf-hostable
8Seedmancerseedmancer.devRecreate Any Test State in SecondsFrom $5/moFree planOpen sourceSelf-hostable
9Step CIstepci.comAutomate API Testing with our open-source API Test Automation frameworkFree planOpen sourceSelf-hostable