Fresh was written to scratch an itch. It works by querying the respective repositories for the various manifests in order to determine if the images have been changed. If so it can do a combination of things:
0means up-to-date and
Fresh is designed to be invoked using cron or systemd timers, and as such provides a light-weight easy-to-use alternative to more complex toolkits.
Fresh is a project that is maintained on my spare time. If you find it useful, please consider contributing to the project or NoccyLabs to show your appreciation!