App uses a unique pitch training method base on not just recognizing musical intervals but reproducing them with maximal precision.

In app, you will see a list of notes. You can play any of them. Try to play your note and remember it. Then choose it, by tapping on it and start sliding from a 'Drag to start' button. You will hear a sound close to your note but with deviation of up to one semitone. Do not release your finger and try to change the pitch by sliding up or down. Your task is to find exactly the note you have just chosen. When you think you have found it — release your finger. You will see how close you were to the actual note. The result is displayed in cents and one cent is a one 100th of a semitone.

You can try different combinations of played and found notes, e.g. play one note, and choose one that is a perfect 4th higher.