* Input modes: Buttons or Piano
* Score history (You'll see quickly how much you improve!)
* Practice treble and bass clef or just one of them as you like
* Three difficulty levels (the harder the more notes with ledger lines you'll get)
* ♯ and ♭ accidentals
* Source code of this app is open-sourced at https://github.com/MelvilQ/noten-lernen