Tempomate is clever and beautiful metronome.
Features
Tempos from 20 to 360 bpm
Tap tempo; during taps, the beats syncronise to your input
Change tempo by 1 or 5 bpm at a time
Click light can be turned on and off
Mouse and keyboard input options
Keyboard Shortcuts
Space: Play / Stop
Up, Down: Change tempo by 5 bpm
Left, Right: Change tempo by 1 bpm
Enter, T: Tap tempo
V: Toggle click light
What’s New:
Version 4.0
New triplet and sixteenth note subdivisions.
Right-clicking on any quarter note adds accent.
New app icon, updated user interface.
Compatibility: OS X 10.10 or later, 64-bit processor