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Insomnia vs Altair GraphQL Client: catalog facts
Insomnia	Altair GraphQL Client
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	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
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Schema docs search with one-click query generation Environments, pre-request scripts and file uploads
Most features expect an account, even though a Scratch Pad works without one The 2023 move to account-first storage cost it a lot of goodwill	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: Apache-2.0	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.