# Chord Colors > Color-coded music theory for guitar and piano. Every scale, chord, and chord progression is drawn as a map of colors, one fixed hue for each of the twelve notes, so the shape of a chord and the distance between notes read at a glance. Chord Colors is a free reference site covering 111 scale types, 89 chord types, and 471 chord progressions in all twelve keys, and a free iOS app. Chord Colors gives each of the twelve pitch classes its own fixed color, so a chord or a scale reads as a pattern of colors rather than a list of note names. The site draws every scale, chord, and progression for both guitar and piano, in any key, on interactive fretboards and keyboards. The free iOS app adds the practice and songwriting tools the reference pages point toward. ## The app - [Chord Colors on the App Store](https://apps.apple.com/us/app/chord-colors-piano-and-guitar/id1422598441): The free iOS app for guitar and piano, with interactive chords and scales, 471 chord progressions, a visual circle of fifths, and songwriting tools. This is the app the whole site is built to send people to. ## Start here - [Chord Colors home](https://chordcolors.com/): What the color system is and how to read it. - [Browse scales](https://chordcolors.com/scales): All 111 scale types, each shown in every key for guitar and piano. - [Browse chords](https://chordcolors.com/chords): All 89 chord types, each shown in every key for guitar and piano. - [Chord progressions](https://chordcolors.com/progressions): 471 progressions with an interactive explorer that plays them back. - [About Chord Colors](https://chordcolors.com/about): The idea behind coloring music, and who it is for. ## Guides - [Common chord progressions](https://chordcolors.com/blog/common-chord-progressions): The progressions behind most popular songs, and how they work. - [Ear training exercises](https://chordcolors.com/blog/ear-training-exercises): How to train your ear to recognize intervals, chords, and scales. - [Learn borrowed chords](https://chordcolors.com/blog/learn-borrowed-chords): Borrowing chords from a parallel key to add color to a progression. ## Scales - [Major scale](https://chordcolors.com/scales/major): the bright, resolved, "happy" sound that anchors most pop, folk and classical music. - [Dorian scale](https://chordcolors.com/scales/dorian): a minor scale with a hopeful lift, thanks to its raised sixth. - [Phrygian scale](https://chordcolors.com/scales/phrygian): a dark, exotic minor with a tense half-step right above the root. - [Lydian scale](https://chordcolors.com/scales/lydian): a major scale that floats and dreams, thanks to its raised fourth. - [Mixolydian scale](https://chordcolors.com/scales/mixolydian): a major scale with a bluesy, dominant twist from its flat seventh. - [Natural Minor scale](https://chordcolors.com/scales/minor): the classic sad, serious minor sound. - [Locrian scale](https://chordcolors.com/scales/locrian): the most unstable mode of all, restless and unresolved. - [Harmonic Minor scale](https://chordcolors.com/scales/harmonic-minor): a minor scale with a dramatic raised seventh, the backbone of classical minor keys. - [Melodic Minor Ascending scale](https://chordcolors.com/scales/melodic-minor-ascending): a minor scale with a major sixth and seventh on the way up, smooth and modern. - [Harmonic Major scale](https://chordcolors.com/scales/harmonic-major): a major scale with a borrowed flat sixth, bright but with a shadow. - [Major Pentatonic scale](https://chordcolors.com/scales/major-pentatonic): the five-note major scale, open and singable with no notes that clash. - [Minor Pentatonic scale](https://chordcolors.com/scales/minor-pentatonic): the five-note minor scale, the first scale most guitarists ever learn. - [Minor Blues scale](https://chordcolors.com/scales/minor-blues): the minor pentatonic with one extra blue note, the classic blues sound. - [Major Blues scale](https://chordcolors.com/scales/major-blues): the major pentatonic with a blue note added, bright but soulful. - [Whole Tone scale](https://chordcolors.com/scales/whole-tone): a scale of nothing but whole steps, floating with no clear home. - [Diminished scale](https://chordcolors.com/scales/diminished): a symmetrical eight-note scale that alternates whole and half steps. - [Chromatic scale](https://chordcolors.com/scales/chromatic): all twelve notes, every half step in the octave. ## Chords - [major chords](https://chordcolors.com/chords/major): The major chord in every key, on guitar and piano. - [minor chords](https://chordcolors.com/chords/minor): The minor chord (m) in every key, on guitar and piano. - [dominant seventh chords](https://chordcolors.com/chords/7): The dominant seventh chord (7) in every key, on guitar and piano. - [major seventh chords](https://chordcolors.com/chords/maj7): The major seventh chord (maj7) in every key, on guitar and piano. - [minor seventh chords](https://chordcolors.com/chords/m7): The minor seventh chord (m7) in every key, on guitar and piano. - [diminished chords](https://chordcolors.com/chords/dim): The diminished chord (dim) in every key, on guitar and piano. - [augmented chords](https://chordcolors.com/chords/aug): The augmented chord (aug) in every key, on guitar and piano. - [suspended second chords](https://chordcolors.com/chords/sus2): The suspended second chord (sus2) in every key, on guitar and piano. - [suspended fourth chords](https://chordcolors.com/chords/sus4): The suspended fourth chord (sus4) in every key, on guitar and piano. - [major sixth chords](https://chordcolors.com/chords/6): The major sixth chord (6) in every key, on guitar and piano. - [minor sixth chords](https://chordcolors.com/chords/m6): The minor sixth chord (m6) in every key, on guitar and piano. - [diminished seventh chords](https://chordcolors.com/chords/dim7): The diminished seventh chord (dim7) in every key, on guitar and piano. - [half-diminished seventh chords](https://chordcolors.com/chords/m7b5): The half-diminished seventh chord (m7b5) in every key, on guitar and piano. - [dominant ninth chords](https://chordcolors.com/chords/9): The dominant ninth chord (9) in every key, on guitar and piano. - [major ninth chords](https://chordcolors.com/chords/maj9): The major ninth chord (maj9) in every key, on guitar and piano. - [minor ninth chords](https://chordcolors.com/chords/m9): The minor ninth chord (m9) in every key, on guitar and piano. - [added ninth chords](https://chordcolors.com/chords/add9): The added ninth chord (add9) in every key, on guitar and piano. - [dominant eleventh chords](https://chordcolors.com/chords/11): The dominant eleventh chord (11) in every key, on guitar and piano. - [dominant thirteenth chords](https://chordcolors.com/chords/13): The dominant thirteenth chord (13) in every key, on guitar and piano. ## Chord progressions - [I V vi IV, the four-chord pop progression](https://chordcolors.com/progression/C/I-V-vi-IV/piano) - [I vi IV V, the 50s and doo-wop progression](https://chordcolors.com/progression/C/I-vi-IV-V/piano) - [ii V I, the home cadence of jazz](https://chordcolors.com/progression/C/ii-V-I/piano) - [I IV V, the three-chord song](https://chordcolors.com/progression/C/I-IV-V/piano) - [vi IV I V, the pop-punk axis progression](https://chordcolors.com/progression/C/vi-IV-I-V/piano) - [I V vi iii IV I IV V, Pachelbel's Canon](https://chordcolors.com/progression/C/I-V-vi-iii-IV-I-IV-V/piano) - [I vi ii V, the rhythm-changes turnaround](https://chordcolors.com/progression/C/I-vi-ii-V/piano) - [i VI III VII, the minor anthem loop](https://chordcolors.com/progression/C/i-VI-III-VII/piano) - [I I I I IV IV I I V IV I I, the twelve-bar blues](https://chordcolors.com/progression/C/I-I-I-I-IV-IV-I-I-V-IV-I-I/piano) - [I I I I IV IV V I, the eight-bar blues](https://chordcolors.com/progression/C/I-I-I-I-IV-IV-V-I/piano) - [I IV vii iii vi ii V I, the descending-fifths sequence](https://chordcolors.com/progression/C/I-IV-vii-iii-vi-ii-V-I/piano) ## Optional - [Sitemap](https://chordcolors.com/sitemap.xml): Every page on the site, for full crawling. The full catalog goes well beyond the lists above. It covers 111 scale types, 89 chord types, and 471 progressions, each available in all twelve keys for both guitar and piano, all reachable from the browse pages.