SWIM APP
SWIM acts as your personalized training log -- customize your program for each day. For each set that you wish to record your timings, either an interval set or a sprint set, SWIM makes your phone a touchpad to precisely record your timings; all you need is a waterproof pouch (you don't even need this if you have a waterproof device).
Completely free! No complicated sign-up process! No privacy issues!