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Imposter vs Specmatic: catalog facts
Imposter	Specmatic
Free Free and open source.	Freemium Core tool is downloadable from GitHub; the Studio, Genie and Insights platform is sold…
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	Generates contract tests and mocks from the same specification Supports OpenAPI, AsyncAPI and many message brokers
Advanced plugins require JVM development Configured through files rather than a graphical interface	Platform features beyond the core tool require contacting sales Assumes you maintain accurate API specifications
Downloadable app, Self-hosted	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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