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Mockoon vs Prism: catalog facts
Mockoon	Prism
Freemium The desktop app and CLI are free and open source; Mockoon Cloud is a paid add-on.	Free Free and open source.
Windows, macOS, Linux, Command line	Command line
No account or remote deployment needed Imports OpenAPI specifications	Mock server generated directly from an OpenAPI file Validation proxy catches contract drift
Focused on REST APIs Hosted deployments require the paid cloud service	Depends on a complete, accurate specification Command-line only
Downloadable app	Downloadable app
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 23, 2026	Official website Full listing and sources Checked September 24, 2026

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