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Altair GraphQL Client vs Apollo Sandbox: catalog facts
Altair GraphQL Client	Apollo Sandbox
Freemium The client is free and open source; Altair GraphQL Cloud is an optional hosted service.	Free Sandbox is free to use.
Windows, macOS, Linux, Web, Browser extension	Web
Schema docs search with one-click query generation Environments, pre-request scripts and file uploads	Nothing to install, runs in the browser Works against any GraphQL endpoint
Focused on GraphQL only, not general REST testing Team sync features rely on the separate cloud service	GraphQL only Proprietary and tied to Apollo's hosted service
Downloadable app, Browser extension	Web application
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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