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Altair GraphQL ClientYaak
Freemium

The client is free and open source; Altair GraphQL Cloud is an optional hosted service.

 Freemium

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

Windows, macOS, Linux, Web, Browser extension Windows, macOS, Linux
  • Schema docs search with one-click query generation
  • Environments, pre-request scripts and file uploads
  • 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
  • Focused on GraphQL only, not general REST testing
  • Team sync features rely on the separate cloud service
  • A much younger project than Postman, with a smaller community
  • No hosted collaboration features if that is what you actually want
Downloadable app, Browser extension Downloadable app
Open source Open source
License not stated License: MIT
No account 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.