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Insomnia vs Advanced REST Client: catalog facts
Insomnia	Advanced REST Client
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free Free to download; the source is published on GitHub.
Windows, macOS, Linux	macOS
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Dedicated desktop app for manual HTTP and REST testing Source code is public and the repository is still active
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	No releases published on the GitHub releases page License is not clearly identified in the repository metadata
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Not stated if an account is 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 October 2, 2026

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