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

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