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ImposterMockServer
Free

Free and open source.

 Free

Free and open source with no SaaS account needed.

macOS, Linux, Self-hosted, Command line Self-hosted, Command line
  • Creates mocks directly from OpenAPI and WSDL files
  • Runs standalone, in Docker, on Lambda or inside tests
  • Mocks and proxies HTTP up to HTTP/3 plus gRPC
  • Records and replays real traffic
  • Advanced plugins require JVM development
  • Configured through files rather than a graphical interface
  • Aimed at developers and test setups rather than manual API exploration
  • Configuration takes some learning for complex scenarios
Downloadable app, Self-hosted Downloadable app, Self-hosted
Closed source Open source
License not stated License not stated
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 24, 2026

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