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Cup vs What's Up Docker: catalog facts
Cup	What's Up Docker
Free Free and open source.	Free Free and open source under the MIT licence.
Web, Self-hosted, Command line	Web, Self-hosted
Fast checks across many images Web dashboard as well as a command-line mode	Supports Docker, Compose, Swarm, Kubernetes and Nomad Works with most public registries and self-hosted OCI registries
Reports updates but does not apply them Maintained by a single developer	Needs to run as its own container or service Automatic updates can break setups if images change behaviour
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License not stated	License: MIT
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 September 23, 2026

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