All 24 keys — always free. Pro unlocks advanced techniques: inversions, Neapolitan, augmented sixths, and more.
Spell major, minor, diminished, and augmented triads across all 24 keys.
Master all seventh chord types including the half-diminished (ø7).
Practice 1st, 2nd, and 3rd inversions with figured bass notation. Bass note first.
Identify keys from sharps/flats, and vice versa. All 24 major and minor keys — basic mode free.
Secondary dominants, borrowed chords, Neapolitan sixths, augmented sixths, and secondary leading-tone chords.
Recognize cadence types and identify the harmonic function of any chord.
Spell sus2 and sus4 chords across all keys — common in contemporary music.
All chord types, keys, and inversions in random order. The ultimate challenge.
Simulate a real proficiency exam. 20 questions in 5 minutes, 80%+ to pass.
20 personalized questions based on your weak areas. Counts toward your streak.