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Imposter vs Mockoon: catalog facts
Imposter	Mockoon
Free Free and open source.	Freemium The desktop app and CLI are free and open source; Mockoon Cloud is a paid add-on.
macOS, Linux, Self-hosted, Command line	Windows, macOS, Linux, Command line
Creates mocks directly from OpenAPI and WSDL files Runs standalone, in Docker, on Lambda or inside tests	No account or remote deployment needed Imports OpenAPI specifications
Advanced plugins require JVM development Configured through files rather than a graphical interface	Focused on REST APIs Hosted deployments require the paid cloud service
Downloadable app, Self-hosted	Downloadable app
Closed 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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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