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Mockbin vs MockServer: catalog facts
Mockbin	MockServer
Free Free and open source, with no sign-up.	Free Free and open source with no SaaS account needed.
Web	Self-hosted, Command line
Custom status, headers and body for a mock endpoint Generates mocks from an OpenAPI 3.x document	Mocks and proxies HTTP up to HTTP/3 plus gRPC Records and replays real traffic
Fixed responses rather than programmable logic Losing browser storage loses the list of your bins	Aimed at developers and test setups rather than manual API exploration Configuration takes some learning for complex scenarios
Web application	Downloadable app, Self-hosted
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.