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Yaak vs Altair GraphQL Client: catalog facts
Yaak	Altair GraphQL Client
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Freemium The client is free and open source; Altair GraphQL Cloud is an optional hosted service.
Windows, macOS, Linux	Windows, macOS, Linux, Web, Browser extension
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	Schema docs search with one-click query generation Environments, pre-request scripts and file uploads
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Focused on GraphQL only, not general REST testing Team sync features rely on the separate cloud service
Downloadable app	Downloadable app, Browser extension
Open source	Open source
License: MIT	License not stated
No account needed	No account needed
Works offline	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.