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Advanced REST Client vs Insomnia: catalog facts
Advanced REST Client	Insomnia
Free Free to download; the source is published on GitHub.	Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…
macOS	Windows, macOS, Linux
Dedicated desktop app for manual HTTP and REST testing Source code is public and the repository is still active	REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional
No releases published on the GitHub releases page License is not clearly identified in the repository metadata	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
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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