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Schemathesis vs Step CI: catalog facts
Schemathesis	Step CI
Free The command-line tool is free and open source.	Freemium The open-source runner is free; the site also lists paid options and demos.
Command line	Command line
Generates edge-case requests automatically from an existing schema Validates responses against the OpenAPI specification	Tests REST, GraphQL, gRPC and SOAP in one format Imports from OpenAPI, Postman and Insomnia
Needs an OpenAPI or GraphQL schema to work from Command-line only, with no graphical client for manual requests	No graphical interface for manual requests Requires Node.js or Docker to run
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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