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KeployMockServer
Free

The core tool is open source.

 Free

Free and open source with no SaaS account needed.

Command line Self-hosted, Command line
  • Builds tests and mocks from recorded API traffic
  • No code changes needed in the application
  • Mocks and proxies HTTP up to HTTP/3 plus gRPC
  • Records and replays real traffic
  • Built around recorded traffic, so coverage depends on what is captured
  • Not a manual request client like Postman
  • Aimed at developers and test setups rather than manual API exploration
  • Configuration takes some learning for complex scenarios
Downloadable app Downloadable app, Self-hosted
Open source Open source
License not stated License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.