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Cartero vs Milkman: catalog facts
Cartero	Milkman
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source.
Linux	Windows, macOS, Linux
Native and lightweight, not a web app No account or cloud subscription required	Plugins for REST, GraphQL, gRPC, Socket.IO and databases Git-based sync of collections
Fewer features than large API platforms Linux is the platform confirmed in the research	Smaller community than mainstream API clients Documentation lives mainly in the repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
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 24, 2026

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