Not the prettiest, but it works great

Its kind of ugly (it hasnt been updated for the Retina Display), its not the easiest to set to a specific tempo, only supports one orientation, and it even ticks in the wrong place (when the arm is on the outside, rather than in the middle).

But it has: (a) the most accurate timing Ive heard from any metronome app, (b) a clear, simple, and loud tick, and (c) a mode ("1/4") with no accent. Excellent.

I hope we see a 2.0 update someday, but even as it is now, I keep coming back to this app because its so good at doing what a metronome is supposed to do.

Kokubu about iMetronome (with quartz accuracy), v1.0