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SchemathesisSpecmatic
Free

The command-line tool is free and open source.

 Freemium

Core tool is downloadable from GitHub; the Studio, Genie and Insights platform is sold…

Command line Windows, macOS, Linux, Command line
  • Generates edge-case requests automatically from an existing schema
  • Validates responses against the OpenAPI specification
  • Generates contract tests and mocks from the same specification
  • Supports OpenAPI, AsyncAPI and many message brokers
  • Needs an OpenAPI or GraphQL schema to work from
  • Command-line only, with no graphical client for manual requests
  • Platform features beyond the core tool require contacting sales
  • Assumes you maintain accurate API specifications
Downloadable app Downloadable app
Open source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked October 2, 2026

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