Chord Progression Builder
Roman numerals, presets & playback

Build chord progressions freely with eight presets, custom degree sequences, BPM control, and playback—for writing, arranging, and theory study.

Tonic root

Preset progressions

Current progressionI - V - vi - IV

I Maj

C

V Maj

G

vi min

A

IV Maj

F

Add chord

Playback

BPM80

Major triads Minor triads Diminished triads

Tips:

After you pick a tonic root, every chord is computed in that major key.
Load a preset or add, remove, and reorder chords freely.
Press Play to hear each chord as an arpeggio in sequence.
Major chords (I, IV, V) use the theme color; minor (ii, iii, vi) blue; diminished (vii°) orange.