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