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apicOpenAPI
Free

Free and open source under the MIT license.

 Free

The CLI is available without charge under the MIT License.

Linux, Command line Windows, macOS, Linux, Command line
  • Keeps contracts as plain JSON in a Git repository
  • Offers CLI, TUI and desktop interfaces
  • Validates and lints OpenAPI, Swagger, Arazzo, and Overlay documents
  • Bundles references, upgrades specifications, and compares or applies overlays
  • Collaboration depends on sharing a Git repository
 Limitations not stated
Downloadable app Downloadable app
Open source Open source
License: MIT License: MIT
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 8, 2026

Checked October 5, 2026

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