New · iOS fretboard companion

Chords & scales on your fretboard

Capo puts Sonid's chord and scale library on an interactive neck for guitar, bass, ukulele, mandolin, and more. Study voicings, intervals, and theory articles without leaving the fretboard.

Get Capo for iOS Explore features

Cmaj7 · voicingGuitar · standard

Tap any note for interval names, chord tones, and links to Sonid articles.

Everything on the neck

From quick chord lookups to deep scale study — Capo is the practice surface for Sonid theory on stringed instruments.

Interactive fretboard

Explore chords, scales, and intervals on a responsive neck diagram. Tap any note for pitch, interval, and theory context.

Sonid theory library

Search and favorite notes, intervals, chords, and scales from the same catalog that powers Sonid — with difficulty filters and tonic controls.

Voicings & full neck

Switch between curated guitar voicings from Sonid and a full-neck view that highlights every chord tone across the fretboard.

Per-note colors

Color each pitch with the Sonid palette — the same hues used on piano keys and chord diagrams across sonid.app.

Flexible labels

Show note names, interval abbreviations, or fret numbers on the neck so you can study the way you think.

Learn tab

Read theory articles pulled from Sonid for the chord or scale you are viewing, without leaving the app.

Shareable deep links

Open any chord or scale from a link — on the web or straight into Capo on iOS — with locale-aware URLs.

Light, dark, or system

Match your device or pick a fixed theme. Capo respects your display preference everywhere in the app.

Plus

Alternate tunings

Unlock drop D, DADGAD, open tunings, 7-string layouts, and instrument-specific presets with Capo Plus.

Plus

Ad-free practice

Capo Plus removes banner ads so you can stay focused on the neck during study sessions.

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Built for your instrument

Switch neck layouts, tunings, and string counts. Capo adapts the same theory tools to the instrument in your hands.

All use cases

Capo Plus

Ad-free practice and the full library

Subscribe to remove banner ads, unlock alternate tunings, and filter the theory picker by advanced difficulty levels — the same catalog as Sonid, on your fretboard.