fretboard

Interactive fretboard visualizer built with egui. Shows notes, scales, and positions on a fretboard with logarithmic fret spacing.

Features

• Multiple tunings: cello (C-G-D-A), standard guitar (E), minor thirds
• Scales: major, minor, blues, dorian, phrygian, lydian, mixolydian, locrian
• Selectable root note
• Logarithmic fret spacing (matches real instrument geometry)
• Cello position brackets
• Hot-reload via subsecond

Build & run

cargo run

Android snail build

ANDROID_NDK_ROOT=/opt/android-sdk/android-ndk-r27c cargo apk build --lib

The debug APK is written to target/debug/apk/fretboard.apk.

Screenshot