Capo: Guitar Chords & Scales

Guitar chords and scales on an interactive fretboard — the fast chord finder and scale reference for guitar, ukulele, bass, mandolin, and more. Capo is the fretboard companion from Sonid music theory.

Look up any chord — Cmaj7, G7, Dm, sus4 — or any scale — major, minor, pentatonic, Dorian, Mixolydian. Pick your root note and see it on the neck instantly. Switch between curated chord voicings (playable guitar and ukulele shapes) and a full-neck view that highlights every chord tone and scale degree across the fretboard.

Capo shares the same chord and scale library as Sonid, so what you learn in theory lessons maps directly to the instrument in your hands.

WHAT YOU CAN DO
• Interactive fretboard for chords, scales, and intervals
• Chord voicing mode and full-neck chord-tone highlighting
• Guitar, bass, ukulele, and mandolin layouts with standard tunings
• Search the Sonid theory library — favorites and difficulty filters
• Note names, interval abbreviations, or fret numbers on the neck
• Learn tab with theory articles for the chord or scale you are viewing
• Open chord and scale links from sonid.app straight into Capo
• Light, dark, or system appearance

GUITAR & STRING PLAYERS USE CAPO TO
• Find where a chord lives on the fretboard before a gig or lesson
• Compare voicing shapes with every available chord tone on the neck
• Study scale patterns and modes in any key
• Plan bass lines by highlighting roots, thirds, fifths, and sevenths
• Explore ukulele and mandolin necks with the same theory tools
• Deep-link from Sonid web articles into the app on your phone

CAPO PLUS
Subscribe for ad-free practice, alternate tunings (Drop D, DADGAD, open tunings, 7-string), and access to the full advanced theory library.

Whether you are learning your first open chords, teaching a student, transcribing a song, or writing progressions, Capo answers one question fast: where does this chord or scale live on my neck?

Part of the Sonid family — download Capo and take music theory to the fretboard.