### 3. Visual Tuning Dashboard - Semi-circular pointer gauge with real-time pitch deviation - Color coding: green (tuned), blue (low to tighten), red (high to relax) - Detection accuracy accurate to ±1 note - Real-time frequency and deviation numerical display ### 4. Interactive guitar headstock interface - Beautiful SVG guitar headstock visualization - Interactive buttons for 6 strin... https://tunerguitar.org