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Yaak vs Cartero: catalog facts
Yaak	Cartero
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux
Requests are stored as files on your machine, so a git repository is the shared collection REST, GraphQL, gRPC, WebSocket and Server-Sent Events in one client	Native and lightweight, not a web app No account or cloud subscription required
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Fewer features than large API platforms Linux is the platform confirmed in the research
Downloadable app	Downloadable app
Open source	Open source
License: MIT	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.