If you have self-hosted home setup with some docker containers that don’t run under HAOS, you can get the same experience as with Add-Ins, by being notified of new image updates via Home Assistant, and if you want triggering an automatic pull and restart.
There’s zero config needed on Home Assistant side, presuming that MQTT is setup and the automatic component discovery hasn’t been turned off. Can also use it with other tools and scripts, since everything happens over regular MQTT topics.
As well as regular image registry pulls, if you have containers that build locally from a cloned git repo, it can check for remote repo changes and trigger a build. And for things that change very frequently, it can do the pull and restart without asking if you want.