What are some alternatives?
When comparing Piano Notes Fun and Type Drummer, you can also consider the following products
Yousician - An interactive guitar-learning app.
Keezy Drummer - Make a beat in seconds
Simply Piano - Fast and fun way to learn piano
Splice Beat Maker - Make and share beats in your browser
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Sampulator - Make (and record) beats on your keyboard