Chord Quiz: Learn Piano Chord app for iPhone and iPad

Chord quiz application to learn chord names and chord component notes.
You can also search chords by chord name or constituent notes.

Functions/Features
- Chord name quiz (select minor, sevens, etc. with buttons)
- Chord component note quiz (select notes on piano keyboard)
- Up to 357 chord questions (21 root notes x 17 chord types)
- Chord sound playback
- Chord search (search by chord name or component notes)
- Chord detail page (check chord type, component notes, inversion form)
- Quiz settings (time limit, waiting time, number of questions, root note of question, chord of question, inversion form)
- Customization (dark mode, theme color)
- Simple design compliant with Material Design