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