ChordCraft
The progression builder
Pick a key, then stack degrees one at a time. Every chord names itself, plays itself, and tells you what it's for — and when your line matches a progression the world already knows, it says so.
Key
Your progression · 4 of 4 bars
The four chords
The pop axis. Familiar on purpose — earn your difference in the melody.
Diatonic chords — free
Borrowed chords & secondary dominants · ChordCraft Pro
Eight bars, the minor four, and the chords from outside the key
Free gives you the seven diatonic chords and four bars — enough to write a real verse. Pro opens ♭VII, ♭VI, ♭III, the minor iv, V7, the secondary dominants and Imaj7, and stretches the canvas to eight bars so a chorus can go somewhere.
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