Don't know about JS, but speaking of metronomes in general, for Android there's a few of them on F-Droid, and last time I checked, the only one that worked cons

Don't know about JS, but speaking of metronomes in general, for Android there's a few of them on F-Droid, and last time I checked, the only one that worked consistently is the one that's integrated in an old app Practice Hub. I don't get it, my phone has a clock that seems to work ok, how hard can it be to click in time?