What are some alternatives?
When comparing Melodics and Synthesia, 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.
Simply Piano - Fast and fun way to learn piano
Yousician - An interactive guitar-learning app.
Playground Sessions - Online piano learning game.
Musicope - The Piano Game. Contribute to oldrich-s/musicope development by creating an account on GitHub.