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Postman vs Altair GraphQL Client: catalog facts
Postman	Altair GraphQL Client
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Freemium The client is free and open source; Altair GraphQL Cloud is an optional hosted service.
Windows, macOS, Linux, Web, Browser extension	Windows, macOS, Linux, Web, Browser extension
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	Schema docs search with one-click query generation Environments, pre-request scripts and file uploads
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	Focused on GraphQL only, not general REST testing Team sync features rely on the separate cloud service
Downloadable app, Web application, Browser extension	Downloadable app, Browser extension
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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