This is literally a paid app in disguise – Metronome - Tap Tempo & Rhythm Review

Felt like an alpha early access game on steam, if you had to pay a recurring subscription and the game was so skeletal that you finish any sort of progression of difficulty etc. Within the first hour of purchase. But hey, it does have a metronome! Why pay a couple bucks at a store for a cheap metronome when you can pay more every single month for a crappy virtual one?
Review by winterbluejay on Metronome - Tap Tempo & Rhythm.