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Cup vs Dockpeek: catalog facts
Cup	Dockpeek
Free Free and open source.	Free Free to self-host, with optional sponsorship.
Web, Self-hosted, Command line	Web, Self-hosted
Fast checks across many images Web dashboard as well as a command-line mode	One-click access to container web interfaces Image update checks
Reports updates but does not apply them Maintained by a single developer	Docker only Lighter on management features than Portainer
Downloadable app, Self-hosted	Self-hosted
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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