Comment by oersted
Side note: for those with large PC game libraries, Playnite is a godsend!
It has a similar UX as RomM, in fact it seems to be inspired by Playnite and has a plugin for it. It also uses most of the same metadata sources.
Playnite is quite mature and powerful now, with a rich ecosystem of extensions, data sources and themes. And even though I am not much of an emulator user, it was easy to hook up to any emulator and local ROM, like Breath of the Wild with Cemu or Pokemon Emerald on VBA.
Not to in any way suggest that you should use Playnite instead of RomM, it looks like a great app, just thought it would be relevant to mention.
I use both, Playnite and RomM are better together!