See any chord or scale on an interactive fretboard. Pick Cmaj7 or Dorian, choose your tonic, and study voicings or a full-neck view with every chord tone highlighted. Tap a note for intervals and links to Sonid theory articles. Same chord & scale library as Sonid — on guitar, bass, ukulele, mandolin, and more. Fully localized in 7 languages, including solfège note naming. Capo Plus adds alternate tunings and ad-free practice. Part of the Sonid family.