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Specmatic vs Prism: catalog facts
Specmatic	Prism
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	Command line
Generates contract tests and mocks from the same specification Supports OpenAPI, AsyncAPI and many message brokers	Mock server generated directly from an OpenAPI file Validation proxy catches contract drift
Platform features beyond the core tool require contacting sales Assumes you maintain accurate API specifications	Depends on a complete, accurate specification Command-line only
Downloadable app	Downloadable app
Closed source	Open 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 September 24, 2026

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