Features:

- Get drilled on notes from the treble and bass clefs

- Optionally include extended octaves (ledger lines) and accidentals (sharps and flats)

- Flexible training algorithm: you tell the app when to consider a note "learned"

- Real piano instrument sounds

- Dark mode for reviewing notes... in the dark!

- Prioritises "landmark notes" like middle C and high G, just like textbook learning materials

- See your progress and response time for each note

- Easily reset learning whenever you like