the Fitbit mobile app
There is no need for larger description if you know how to read binary. Otherwise it takes some time to read the time in time. (Hint: It's 16:45 and 2 seconds on the screenshot)
The design is simple and elegant for all who want to have all information on a glance without switching. See all you need to know about your heartbeat, steps, floors, distance and activity in contrasting white on a black background. A must-have for geeks and nerds!