The 7-string guitar adds a low B string below standard tuning, opening up a deeper range favored in metal, jazz fusion, and progressive rock. ChordColor renders all 528 chord types across this extended fretboard with color-coded intervals, so you can see how voicings shift when that extra low string is available. Chords that sound muddy in the low register become visually obvious -- you can spot which intervals cluster too close together before you even strum.
Two tunings are supported: Standard BEADGBE and Drop A (AEADGBE). Drop A lowers the 7th string by a whole step, giving you power chords with a single finger on the bottom two strings -- essential for djent and modern metal rhythm playing.
The voicing algorithm accounts for the wider string spread, prioritizing playable shapes that use the low B for bass notes while keeping upper chord tones on the middle and high strings. This mirrors how 7-string players actually voice chords in practice -- separating the bass root from the upper harmony to maintain clarity across the extended range.