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MockServerKeploy
Free

Free and open source with no SaaS account needed.

 Free

The core tool is open source.

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

Checked September 24, 2026

Checked October 1, 2026

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