I won't embarrass myself by showing a picture of my metronome, but it's the sort individuals of a certain age might have seen on their grandparents' pianos! In lock-down, I've been trying to teach myself Deantown, which requires a certain mastery of consistent 1/16 notes. I find myself completely lost if I use said metronome, but there's a certain adrenaline rush when I play a long with the vid and/or a tutorial with the bass drum giving it some.
Which is a convoluted way of asking basschatters whether they recommend an '808 esque' app (if such a thing exists on a phone) to emulate the poor person dribbling out of both sides of their mouth at once (at least if the phone is level)?