Chronos was a fun side project in the heyday of realistic and skeuomorphic app design. It was an accurate and realistic analog stopwatch, including little details like the hand supporting both ticking and continuous movement, as well as both the second and minute hands winding back to the beginning when tapping reset.
It was not intended to be (and did not become) a financial success, but it was retired when the iPhone grew vertically with the iPhone 5 in 2012 and the designer joined a certain fruit company.