Compare software

Scalar API ClientYaak
Freemium

The open-source client is free; the wider Scalar platform has commercial offerings.

 Freemium

Yaak is MIT licensed and free to build and use. Development is funded by…

Web Windows, macOS, Linux
  • Understands OpenAPI descriptions
  • Open source on GitHub
  • Requests are stored as files on your machine, so a git repository is the shared collection
  • REST, GraphQL, gRPC, WebSocket and Server-Sent Events in one client
  • The website focuses on the commercial docs and SDK platform rather than the client
  • Most useful when an OpenAPI description exists
  • A much younger project than Postman, with a smaller community
  • No hosted collaboration features if that is what you actually want
Web application Downloadable app
Open source Open source
License not stated License: MIT
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 23, 2026

Checked September 21, 2026

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