Capo: Guitar Chords & Scales

Interactive guitar chord & scale fretboard for ukulele, bass, and mandolin. Voicing shapes, full-neck view, and tunings — free to explore.

See any chord or scale on an interactive fretboard — guitar, bass, ukulele, mandolin, and more. Capo is the practice companion from Sonid.

Pick a chord like Cmaj7 or a scale like Dorian, choose your tonic, and study it on the neck. Switch between curated voicings and a full-neck view that highlights every chord tone. Tap any note for interval names, pitch info, and links to Sonid theory articles.

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

Features:

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

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 shapes, teaching a student, or writing songs, Capo answers one question fast: where does this chord or scale live on my neck?

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

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