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

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