SwimSec

SwimSec turns your iPhone into the pace clock every swimmer knows from the pool deck. Four colored hands (yellow, red, blue and green) sit a quarter turn apart, so a hand reaches 60 every 15 seconds and your next send-off is always in view. Tap the clock to give the next hand a fading tail that is easier to follow. The screen stays on while you train, and the clock follows your iPhone's time, so several phones placed around the pool show the same second. Open it, set it down, swim.