SHSelfHostIndex
CU

Cup

Fast checker for available Docker image updates

Automation & Workflows ★ 1.3k stars Easy setup MIT

Cup is a lightweight tool written in Rust that checks your Docker containers for available image updates. It offers a CLI, a web dashboard, and a JSON API for integration with monitoring systems.

Official siteSource code

Key features

  • Fast update checks
  • Web dashboard and CLI
  • JSON API
  • Very low resource use

Strengths

  • Released under the MIT license
  • Easy to set up — beginner-friendly
  • First-class Docker support for quick deployment
  • Active community (1.3k GitHub stars)

Is Cup secure?

OSV.dev has no published security advisories for Cup's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Cup replaces

Self-hosted Watchtower alternatives

Health badge

Maintain Cup? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 71 · good

Markdown
[![SelfHostIndex health score for Cup](https://selfhostindex.com/badge/cup-docker.svg)](https://selfhostindex.com/app/cup-docker/)
HTML
<a href="https://selfhostindex.com/app/cup-docker/"><img src="https://selfhostindex.com/badge/cup-docker.svg" alt="SelfHostIndex health score for Cup"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/cup-docker.svg
   :alt: SelfHostIndex health score for Cup
   :target: https://selfhostindex.com/app/cup-docker/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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