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Specmatic vs Imposter: catalog facts
Specmatic	Imposter
Freemium Core tool is downloadable from GitHub; the Studio, Genie and Insights platform is sold…	Free Free and open source.
Windows, macOS, Linux, Command line	macOS, Linux, Self-hosted, Command line
Generates contract tests and mocks from the same specification Supports OpenAPI, AsyncAPI and many message brokers	Creates mocks directly from OpenAPI and WSDL files Runs standalone, in Docker, on Lambda or inside tests
Platform features beyond the core tool require contacting sales Assumes you maintain accurate API specifications	Advanced plugins require JVM development Configured through files rather than a graphical interface
Downloadable app	Downloadable app, Self-hosted
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	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.