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dockcheck vs Cup: catalog facts
dockcheck	Cup
Free Free and published on GitHub.	Free Free and open source.
Linux, Command line	Web, Self-hosted, Command line
Checks for updates without pre-pulling images Interactive or fully unattended operation	Fast checks across many images Web dashboard as well as a command-line mode
Command-line only, no graphical interface Works with Docker containers only	Reports updates but does not apply them Maintained by a single developer
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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