Dual metronome. It may be useful for tuplets or polyrythm exercises.

Single Tap starts/stops the metronome.
Dragging vertically changes the tempo.
By Pinch in/out you can set the beats.

1 - 12 beats
4 - 2400 bpm (see below)
6 types of sound
volume, pan settings
bookmarks
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ver. 2.0 (2014.06):
New tab interface.
Bookmarks available.

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From ver. 1.3 the beats value has no constrain. Simply the entire length is limited in 300 - 15000 [ms]. The bpm range depends on the beats value: 4 - 200 bpm on 1 beat, 48 - 2400 bpm on 12 beats.