Guitar fretboard practice tool. Pick notes from chord shapes on the fretboard, generate random sequences to practice.

• Interactive fretboard — click to select/deselect notes
• Presets for E-shape chords and arpeggios (Major, Maj7, Major Scale)
• Random note sequence generator with configurable bar count
• Jianpu (numbered notation) with octave dots
• String labels on each note
• Seeded PRNG — same seed produces the same sequence across refreshes
• Light/dark theme with localStorage persistence
• PWA — installable, works offline
• Responsive — desktop sidebar, tablet/phone stacked layout

Open index.html in a browser, or visit the GitHub Pages deployment.

1. Pick a preset or click notes on the fretboard
2. Click Generate to roll a new random sequence
3. Practice the generated notes on your guitar

Static HTML/JS — no build step. Push to GitHub and enable Pages, or open index.html directly.

Single index.html with embedded CSS and JS. No frameworks, no dependencies.