After testing a lot of them, I landed on this one:
https://f-droid.org/...

Perhaps not the most advanced metronome, but it's open-source and have all the things I need.

It's a must have tool for any drummer (imo), even if you don't use one to practise, having a metronome behind the kit can save many lengthy arguments ;-)
I don't use it live that much, but for songs that require sync with an echo or similar situations I use it for count in.

I also tested a few commercial ones, at best they had annoying popups, and some didn't even keep the beat.