Compare software

Prism vs Imposter: catalog facts
Prism	Imposter
Free Free and open source.	Free Free and open source.
Command line	macOS, Linux, Self-hosted, Command line
Mock server generated directly from an OpenAPI file Validation proxy catches contract drift	Creates mocks directly from OpenAPI and WSDL files Runs standalone, in Docker, on Lambda or inside tests
Depends on a complete, accurate specification Command-line only	Advanced plugins require JVM development Configured through files rather than a graphical interface
Downloadable app	Downloadable app, Self-hosted
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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