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Diun vs Cup: catalog facts
Diun	Cup
Free Free and open source under the MIT license; donations accepted.	Free Free and open source.
Self-hosted, Command line	Web, Self-hosted, Command line
Detects both new tags and digest changes Runs as a single binary or a container	Fast checks across many images Web dashboard as well as a command-line mode
Notifies only; does not update containers itself Configuration is file-based with no graphical interface	Reports updates but does not apply them Maintained by a single developer
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License: MIT	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 23, 2026	Official website Full listing and sources Checked September 24, 2026

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