Chord Library: Pick any root, quality, and modifier from the drum-roll wheels. Every inversion and voicing — cowboy chords first, then up the neck — at your fingertips. Chord Finder: Tap the interactive fretboard to select your notes and instantly identify any chord — name, quality, and inversion — no matter how complex the voicing. Tuning support: Standard, Drop D, Half Step Down, Open G, DADGAD and more. Every diagram recalculates instantly when you switch tuning. Extensions & Mods: Add b9, 9, #9, 11, #11, b13, 13, add9, sus2, sus4, power, 6th and more. The calculator finds every fingerable shape, not just the textbook ones. Clean & Fast: No sign-up. No ads. No internet required. A focused tool that gets out of the way and lets you play.