Rudd is an app for Pebble that helps you manage time by vibrating on a set interval. When you're working out for a given interval, don't keep checking your watch, set Rudd for 1-2 minutes. Time flies when you're having fun, but drags on when you're bored, so set Rudd to 5-15 minutes to give your mind a new perception of time. Set Rudd for 30-60 minutes to remind yourself to take a study break.