What are some alternatives?
When comparing Chordana Play and Jameasy for Violin, you can also consider the following products
Flowkey - The easiest way to learn piano with your iPhone or iPad
Simply Piano - Fast and fun way to learn piano
Yousician - An interactive guitar-learning app.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Pianu - Learn to play the piano in your browser.
alphaTab - alphaTab is a cross platform music notation and guitar tablature rendering library.