Cadenza
C · E · G♭
Three notes in, three notes named. Chord tools have been known to call this shape a D9. There is no D in it.
How it decides
It will not add a note you didn't play.
One set of notes usually has more than one correct name. Cadenza picks one and follows a rule you can check. Here is what it does with the cases that break other tools — screenshots, not claims. And the whole live view is the free tier: naming this careful costs nothing, forever.
C · G · B
A shell voicing, named as a shell voicing. Not a Cmaj7 that promises an E you never touched.
C · E♭ · F
Rooted where your hand is. Not four notes away, as an F7sus4 inversion that nobody was playing.
B · D · F · A
ø7, because it is ø7. Written the way a chart writes it, with the alternatives underneath and the degree in the key below that.
G · B · F · A♭
The alteration in brackets. Where a musician expects to read it — and set in a font that actually has a ♭.
F · A♭ · C · E
Minor-major, not A♭aug over F. The chord that turns most naive detectors into a slash reading nobody would play.
The whole preference order, in five lines
- Coverage first. A name that leaves one of your notes unexplained is out before anything else is weighed.
- No phantom tones. A name may not promise notes nobody played.
- Inversions stay inversions. A slash reading is penalised, never preferred.
- Root in the bass wins. A shell voicing only convinces when it is rooted where you played it.
- Shells pay a surcharge. Dropping a third is a claim the engine has to earn.
Nothing here is a model or a guess. It is a lookup and a ranked preference, running offline on your machine — which is why it can promise never to invent a note, and a system that guesses cannot.
88 naming tests · 1 474 shapes swept · 0 invented notes
While your hands are still down
Four answers, at once.
Put one window on the screen your students are watching and harmony stops being abstract. The moment your hands land, the same chord appears four ways — and nobody has to redraw it on a whiteboard.
1 · Do · C. Each pressed key carries its chord tone, its solfège name and its letter — the three things a student is holding in their head at once. Eighty-eight keys, and the labels appear only on the ones you are actually pressing.
Written as you play. The staff keeps what came before, so a progression stays readable while you explain the last chord of it — and each chord carries the name it was given.
The name, the notes, the keys, the degree.
Four windows, one keyboard, no lag between them. Everything below happens in the same instant your hands land — and stays on screen after you take them off.
- The chord name — written the way musicians read it, with the honest alternatives underneath
- On the grand staff — real notation, spelled for the chord: D♯ or E♭, never a coin toss
- On the keys — which notes, in which octave, labelled three ways
- The degree in the key — the Roman numeral, so theory lands in context and not in a vacuum
- Freeze it — play a chord, take your hands off, and it stays written while you talk about it
- Velocity and pedal are read too — soft playing sounds soft and darker; the sustain pedal is what lets it tell a line from a chord
Three modes, one switch. The same three screenshots, taken from the same window.
Every chord gets a second opinion.
Play a chord and the app has something to say about it: a line from someone who spent their life at a piano, the theory behind the harmony, or a joke at your expense. You pick which, and you pick the themes it draws from. A shuffle bag makes sure nothing repeats until you have heard it all.
- 895 quotations, from 162 musicians and teachers
- 1 348 theory notes, chosen for the chord under your hands
- 224 jokes, scaled to how far out the chord is
- All of it in the free tier — the chord window with its quotes, theory and jokes ships in Basic, for nothing
It stays quiet until you are actually playing a line. Pedal down, six different pitch classes, no octave doubles, spread over more than half a second — then it names the scale. Three notes will not make it shout a mode at you.
And a dictionary that works both ways.
Type a chord and see it written, lit and voiced. Type a scale and watch it appear under your hands. Or play something and let the app do the typing.
Play it once.
macOS 12 or later · Windows 10 and 11 · no account, no card
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