https://fretengine.com/ 2026-04-16 weekly 1.0 https://fretengine.com/screenshots/fretengine_hero.png fretengine guitar fretboard visualization with chord and scale overlays Interactive guitar fretboard showing chord and scale layers to visualize music theory connections https://fretengine.com/screenshots/fretengine_dorian.png Dorian scale layered over a minor 7th chord on the fretboard See why Dorian works over a m7 chord with layered visualization showing overlap https://fretengine.com/screenshots/fretengine_caged.png CAGED system and chord display modes on the fretboard Multiple display modes from pentatonic shapes to CAGED zones to altered dominants https://fretengine.com/screenshots/fretengine_timeline.png Timeline sequencer and metronome with synced fretboard Practice chord progressions synced to the metronome with real-time fretboard visualization https://fretengine.com/llms.txt 2026-04-15 monthly 0.5 https://fretengine.com/llms-full.txt 2026-04-15 monthly 0.5