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Nitro vs Altair GraphQL Client: catalog facts
Nitro	Altair GraphQL Client
Freemium Free to start, with paid options for teams on the ChilliCream platform.	Freemium The client is free and open source; Altair GraphQL Cloud is an optional hosted service.
macOS, Web	Windows, macOS, Linux, Web, Browser extension
Dedicated environment for exploring and querying GraphQL APIs Works alongside Hot Chocolate and Fusion on .NET	Schema docs search with one-click query generation Environments, pre-request scripts and file uploads
Focused on GraphQL rather than REST or other APIs Product site is aimed mainly at enterprise platform users	Focused on GraphQL only, not general REST testing Team sync features rely on the separate cloud service
Downloadable app, 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
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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