Feedback for dev.
FYI, “Tempo” is the same as BPM. If asked “what is the tempo?”, the response would be expressed in BPM, e.g. “the tempo is 120 BPM”. What you are expressing with your “tempo” is in fact METER.
Apple Watch!
If you are looking for a silent metronome that uses haptic feedback to keep time, this is your app! Simply the best app for this! I've tried every other app and none vibrate as strong and precise as this one. You even feel the accented beat.