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About ChordLookup

chordlookup.com is a free, client-side chord reference and practice toolkit for guitar, piano, ukulele, and bass. Every chord page, tool, and practice workflow runs entirely in your browser — there are no accounts, no server-side databases, and nothing you do here is sent anywhere unless you explicitly share it.

Last reviewed: September 2026.

Coverage

The chord library covers 336 chords built from 28 qualities (major, minor, sevenths, suspended, diminished, augmented, extensions and alterations) across all 12 western roots. Every combination has a dedicated, statically-generated page with fretboard diagrams, piano diagrams, note and interval breakdowns, fingerings, and audio previews.

Beyond individual chords, the site ships dedicated pages for 12 scale types across 12 roots (144 scale pages), 28 chord-quality hubs, 12 root hubs, song and progression browsing, and a full music-theory glossary.

Who It’s For

ChordLookup is built for working musicians at any level:

  • Beginners learning open-position shapes, looking up songs, and building first chords.
  • Intermediate players exploring barre chords, seventh chords, diatonic progressions, and basic substitution.
  • Advanced players digging into jazz voicings, extended harmonies, modal interchange, and voice leading.
  • Guitar, piano, ukulele, and bass players — every chord ships with instrument-specific diagrams, fingerings, and alternative voicings.

How Chords Are Constructed

Each chord in the library is built from first principles using standard music theory: a root note combined with an interval stack that defines the quality (e.g. major = root, major third, perfect fifth; minor 7 = root, minor third, perfect fifth, minor seventh). Notes are derived from equal-temperament pitch classes, so enharmonic spellings (C♯/D♭, F♯/G♭) resolve to the same pitch and the same chord.

Fretboard voicings are generated from playable shapes on standard tunings (EADGBE for guitar, GCEA for ukulele) and ranked by playability difficulty. Piano voicings use standard keyboard fingering where applicable. Every diagram is interactive — click a note or fret to hear it, or use the on-page audio buttons for full chord and arpeggio previews.

The Toolset

Alongside the chord library, ChordLookup ships 38 free practice and theory tools, organized into four categories:

  • Lookup — Find the right chord, key, or substitution fast.
  • Progressions — Compose, analyze, transpose, and resolve chord movement.
  • Practice — Train recall and keep focused drill workflows handy.
  • Guitar — Plan playable shapes and capo positions for real sessions.

Tools include ear training, interval recognition, a metronome with setlist and steadiness scoring, flashcards with smart spaced practice, a chord finder, a chord-relationship explorer, capo planning, progression analysis, a progression library, and many more. Browse the full directory on the tools page. See what’s new on the changelog.

Privacy & Your Data

ChordLookup does not require an account and does not collect personal information. Your favorites, practice history, notes, and preferences are stored locally in your browser’s localStorage — they never leave your device. We use a privacy-focused, cookieless analytics service (Rybbit) for aggregate traffic counts only. The full details are in our privacy policy.