ChordOne - Chords Toolkit

80,000+ musicians are using this portable chord assistant!

Explore chords, master harmonic rules and spark creative inspiration with intuitive interactive tools.
Look up chords anytime, anywhere, and listen to experience chord colors.
Whether you are a music beginner or professional musician, quickly find chords and improve your harmony skills efficiently.

【App Features】
- Massive Chord Library: Includes 1500+ piano chords, 2500+ guitar fingerings and 1000+ ukulele chord fingerings, covering a wide range of commonly used chords.
- Multi-dimensional Visual Analysis: View chord symbols, component notes, piano key diagrams, fingering charts, chord construction theory, inversions, staff notation and circle of fifths. Go beyond chord shapes and truly understand the underlying logic of harmony.
- Professional Chord Playback: Tap to play chord audio and feel the emotional tone of each chord. Switch between piano / guitar / ukulele. Customize playback speed, playback range and play mode. Built-in reverb and delay effects.
- Build Your Own Chord Progressions: Combine chords freely to create unique harmonic movements. Break free from generic patterns and craft your own musical style!

【Core Functions】
- Chord Lookup: Search by chord type, reverse lookup by keys, text search. Multiple ways to locate chords quickly.
- Modal Chords: Generate diatonic chords for any key, showing chord symbols, component notes and harmonic relationships. Ideal for harmony arrangement, impromptu accompaniment and songwriting.
- Interactive Circle of Fifths: Visualize harmonic relationships. A practical tool for composition, improvisation and music arrangement.
- Chord Progressions: Predefined classic progressions. Create custom chord sequences, export MIDI files for seamless integration with DAWs including GarageBand, Cubase, Logic Pro and more.
- Guitar Chord Library: 100 chord types with over 2500 fingerings.
- Ukulele Chord Library: 100 chord types with over 1000 fingering diagrams.
- Chord Ear Training: Train your ear to recognize chords step by step, from triads to ninth chords.
- Chord Beginner Courses: Beginner-friendly video tutorials covering basic chords all the way to advanced extended chords.

【Chord Types】
Covers beginner to professional-level chords for pop, classical, jazz and other music genres:
Triads, seventh chords, altered seventh chords, sus chords, added tone chords, ninth chords, altered ninth chords, eleventh chords, altered eleventh chords, thirteenth chords, altered thirteenth chords, power chords, major sixth chords, minor sixth chords, six-nine chords, minor six-nine chords, etc.

【Modal Chord Types】
Diatonic triads, diatonic seventh chords, diatonic sus chords, diatonic added tone chords, diatonic extended chords, other diatonic chords, secondary chords, secondary seventh chords, secondary leading tone chords, secondary leading tone seventh chords.

【User Reviews】
“I can quickly check chord tones and train my ear to identify notes in each chord. It helps me solve chord problems easily when playing piano. Convenient and efficient.”
“Finally an app that explains chords so clearly!”
“Perfect for chord lookup while composing scores.”
“Great app, very easy to find chords.”
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Chord One, explore infinite possibilities of chords.
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