Chordology

See music.
Hear music.
Understand it.

Chords and scales, beautifully visualized. Every note has a colour, every chord plays back — on piano, guitar, bass, banjo and ukulele.

Download on theApp Store Free on iPhone & iPad
Piano Guitar Bass Banjo Ukulele
Chordology showing a C major chord on the guitar fretboard, each note colour-coded
The colour system

A colour for every note.

Twelve pitch classes, twelve hues. A note looks the same whether you’re reading a fretboard, a keyboard or a tab — so shapes and patterns finally click.

Learn the colours once, and every instrument reads the same.

Every way to look

One chord. Every view.

See the same chord as a fretboard, a keyboard, a chord diagram or tab — switch instrument and view in a tap, and the colours carry across.

C major on guitar fretboard
Fretboard
The whole neck, lit up
C major on a colour-coded piano keyboard
Keyboard
Keys in their colours
E flat minor chord diagram
Chord diagram
Every voicing, paged
G minor shown as tablature
Tablature
Fret numbers, read fast
More than a reference

Play it. Learn it. Tune it.

Hear every chord

Tap play and listen back. Roll it as a strum, hit it as a block, or walk it as an arpeggio.

StrumBlockArpeggio

Scales & real theory

Major, minor, modes and more — with degree numbering and the interval pattern spelled out for every scale.

W·W·H·W·W·W·H

Tunings & capo

Standard, drop, open and alternate tunings on every instrument — place a capo on any fret and everything updates.

Drop DOpen GCapo
Good to know

Frequently asked questions

Which instruments does Chordology support?

Piano, guitar, bass, banjo and ukulele — each with standard, drop, open and alternate tunings, and a capo you can place on any fret. Switch instrument in a tap and every chord and scale redraws instantly.

Can I hear the chords and scales play back?

Yes. Tap play to hear any chord as a strum, a block or an arpeggio, and step through scales note by note — so you can check a voicing by ear as well as by eye.

How does the colour system work?

Each of the twelve notes has its own colour, and that colour stays the same across the fretboard, keyboard, chord diagrams and tab. Learn the colours once and every instrument reads the same, so shapes and patterns finally click.

Is Chordology free?

Yes — Chordology is free to download on iPhone and iPad, with every instrument, view and tuning included.

Start seeing music.

Free to download on iPhone and iPad. Every instrument, every view, a colour for every note.