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

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