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Altair GraphQL ClientPostman
Freemium

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

 Freemium

A free tier covers individual use with limits on collaborators, collection runs and…

Windows, macOS, Linux, Web, Browser extension Windows, macOS, Linux, Web, Browser extension
  • Schema docs search with one-click query generation
  • Environments, pre-request scripts and file uploads
  • The most widely used API client, so collections and tutorials for it are everywhere
  • Collections with environments, pre-request and test scripts, and a built-in runner
  • Focused on GraphQL only, not general REST testing
  • Team sync features rely on the separate cloud service
  • Built around a cloud workspace, and an account is effectively required
  • Offline and local-only use has become harder over successive versions
Downloadable app, Browser extension Downloadable app, Web application, Browser extension
Open source Closed source
License not stated License not stated
No account needed Account needed
Not stated if it works offline Needs internet

Checked September 23, 2026

Checked September 21, 2026

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