The Chores Teacher app is free app for Android aimed at learning chords and intervals. The app is constructed for multiple users and the score is stored for all of them. The app can be used for both learning with and without a score but the exercise is the same. The only difference is that the level of difficulty can be more customized in the free play mode. There is a background animation with a rotating key of G, which is, if I were to call it, made in Blender. In the settings you can change the note notation by selecting out of four the notation that you want to learn on. This app might just as well help you learn a new music notation and the chords at the same time. What is great about this app is that it is able to us the back button for the Android OS. The other music apps usually quit when you press the back button. The app can be used on screens any size and can function on outdated Android versions. The Chords Teacher app is a brilliant app for learning chord relatives and intervals.