This tool works in both directions: forward lookup (select root + quality → fingering appears on the diagram) and reverse naming (tap the frets or piano keys → the tool resolves the pitch set to a chord name live). Note names (C D E) are universal, so language switching only affects labels — not the diagram itself.
Reading a chord diagram: ○ means open string (play open), ✕ means muted (don't play), numbers (1–4) inside dots indicate finger positions. The notation "x-3-2-0-3-0" lists fret positions for strings 6 through 1, the most common shorthand for guitarists. When no common open voicing exists, the tool generates a movable barre shape and shows a dashed outline to indicate "this shape slides up and down the neck."
Supported instruments: guitar (standard EADGBE), ukulele (standard GCEA), and piano. Supported chord qualities: major, minor, 7, maj7, m7, m7b5, add9, sus2, sus4, dim, aug. Use the ♯/♭ button (top-right) to switch note spelling between sharps and flats (a display switch only — it doesn't change the fingering). If a tapped pitch set doesn't match any supported quality, the tool shows "unknown shape" rather than guessing a wrong name.