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Insomnia vs RESTer: catalog facts
Insomnia	RESTer
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free Free browser extension.
Windows, macOS, Linux	Browser extension
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Any HTTP method, headers and body Saved requests for reuse
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	Runs only inside the browser Fewer collaboration features than full API platforms
Downloadable app	Browser extension
Open source	Closed 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 24, 2026

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