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Prism vs MockServer: catalog facts
Prism	MockServer
Free Free and open source.	Free Free and open source with no SaaS account needed.
Command line	Self-hosted, Command line
Mock server generated directly from an OpenAPI file Validation proxy catches contract drift	Mocks and proxies HTTP up to HTTP/3 plus gRPC Records and replays real traffic
Depends on a complete, accurate specification Command-line only	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
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 September 24, 2026

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