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RESTer vs Insomnia: catalog facts
RESTer	Insomnia
Free Free browser extension.	Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…
Browser extension	Windows, macOS, Linux
Any HTTP method, headers and body Saved requests for reuse	REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional
Runs only inside the browser Fewer collaboration features than full API platforms	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
Browser extension	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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