What are some alternatives?
When comparing Chordana Play and Yousician, 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
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
TuxGuitar - A Multitrack tablature editor and player.
Pianu - Learn to play the piano in your browser.
Synthesia - A fun way to learn how to play the piano.