This application is fully self-contained, responsive, and uses a premium, modern SaaS aesthetic. It adheres to all sandboxing constraints and architectural requirements. ```html Free Ukulele Fret Stretch & Finger Reach Visualizer

Free Ukulele Fret Stretch & Finger Reach Visualizer

Interactive scale visualization for ukulele players.

Configuration

Instrument Size

Display Units

Chord Overlay

How to use

Select your instrument.
Click any two frets to calculate distance.
Toggle chord overlays to see shapes.

Select two frets to measure distance.