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Prism vs Mockbin: catalog facts
Prism	Mockbin
Free Free and open source.	Free Free and open source, with no sign-up.
Command line	Web
Mock server generated directly from an OpenAPI file Validation proxy catches contract drift	Custom status, headers and body for a mock endpoint Generates mocks from an OpenAPI 3.x document
Depends on a complete, accurate specification Command-line only	Fixed responses rather than programmable logic Losing browser storage loses the list of your bins
Downloadable app	Web application
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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