trackSlate is a fully functional clapper board for video and film production, and all the numeric values can be fast changed using swipe gestures.
And it can be remoted from another iOS device, a Mac or a PC!
Gestures:
Up and down increase and decrease the value by one unit ("1" + swipe up = "2").
Left and right add or subtract a letter ("1" + swipe right = "1A").
Long tap on a value to reset it.