What are some alternatives?
When comparing Piano Notes Fun and Flowkey, you can also consider the following products
Yousician - An interactive guitar-learning app.
Simply Piano - Fast and fun way to learn piano
Pianu - Learn to play the piano in your browser.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Synthesia - A fun way to learn how to play the piano.
Jameasy for Violin - Play rhythm game with a real violin. you can play with background music and real-time feedback