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Insomnia vs Cartero: catalog facts
Insomnia	Cartero
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Native and lightweight, not a web app No account or cloud subscription required
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	Fewer features than large API platforms Linux is the platform confirmed in the research
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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