CadenzaFree chord finder · nothing to install
What chord is this?
Play it — on a MIDI keyboard, with the mouse or on your computer keys — and it is named the way a jazz musician would write it, by the same engine as Cadenza.
Click keys to hold them, click again to let go · keys Z–M and Q–U play two octaves · Esc clears
How pianists voice it
A MIDI keyboard
Plug it in and press Connect MIDI keyboard. Chrome, Edge and Opera can read MIDI; Safari cannot yet. The sustain pedal works — hold it and the chord keeps building.
Mouse or touch
Click a key to hold it, click it again to let it go. Build the chord a note at a time — the name changes as you add each one.
Your computer keys
Z to M play C3 to B3 with the sharps on the row above; Q to U play the octave above. Most laptops can hold four or five keys at once.
Share it
Copy link puts the chord in the address itself. Paste it in a forum thread or a lesson chat and whoever opens it sees — and hears — the same keys.
How the name is decided
The lowest note matters. C–E–G–B♭–D–A over a C in the bass is C13; the same keys with E underneath are written C13/E, and without the C at all they are something else again — which is exactly why jazz pianists can leave the root to the bass player. When a set of notes has more than one honest reading, the others are listed underneath the name.
Spelling follows the chord, not a blanket setting: G7 is spelled with a B, B♭7 with an A♭, F♯m7 keeps its sharps. Altered dominants are written the way charts write them — 7(♭9), 7(♯9♭13), 13(♯11) — and a chord you would call C7(♭5) is named for the note it really is, the ♯11.
Every named chord links to its page in the chord library: the notes, the shell and rootless voicings, the inversions, all twelve keys.
This is one window of Cadenza.
The app does this while you play — every chord, live, with the degree over each key — and then keeps going: it writes what you played as sheet music, puts the keyboard and the chord names into OBS, and teaches the voicings. Basic is free forever.