What are some alternatives?
When comparing MyMusicTeacher and Flowkey, you can also consider the following products
Yousician - An interactive guitar-learning app.
Simply Piano - Fast and fun way to learn piano
Pianu - Learn to play the piano in your browser.
iReal Pro - iReal Pro – Music Book and Backing Tracks is a commercial music app developed by Technimo for Android and iOS devices.
Synthesia - A fun way to learn how to play the piano.
TuxGuitar - A Multitrack tablature editor and player.