Keys is a simple and clean typing trainer for the Mac. It introduces the keys of the keyboard in 24 lessons, increasing the area in small steps. The application shows for each character in the lessons the finger which should type it, and where that finger needs to move. At any time, the learner can review her or his performance, which shows error rate and speed. To drill down more, use a line chart visualization or keyboard heatmap, to see the learning effect over time or performance by key.