What are some alternatives?
When comparing Simply Piano and Yousician, you can also consider the following products
Flowkey - The easiest way to learn piano with your iPhone or iPad
Pianu - Learn to play the piano in your browser.
TuxGuitar - A Multitrack tablature editor and player.
Touch Pianist - Play piano like a pro without playing piano.
Playground Sessions - Online piano learning game.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.