Sure, but that doesn’t make any difference in the maintenance effort required.

If I write my own Dockerfiles to tag my own images I also have to run my own update management.
I like to outsource this, so all I have to do is a simple docker compose pull (or in reality, let Dockhand or watchtower handle it).

https://gosuki.net/
This one?

Looks like it doesn’t come with docker and seems like you don’t get access to the full source on the free version?