SUS4 Scale Lab

Every scale, every mode, every instrument. Scale Lab is the reference you keep open during practice when you are learning a new mode, checking what notes belong to a harmonic minor in B, or visualising a Dorian scale across the guitar neck. It covers every standard scale and mode — 150+ entries across 15 categories — displayed on guitar fretboard and piano keyboard. Switch root notes and scale types instantly. Scale positions light up across the neck. The app does not lecture; it shows you the information and gets out of the way. • Every common scale and mode: major, minor, pentatonic, modal, and more • Guitar fretboard view with scale positions across the neck • Piano keyboard view with scale notes highlighted • Switch root note and scale type instantly • Unlock: 150+ catalog scales, Theory cards, Mode Comparison, Practice Loop No account. No mic. Runs fully on-device. Free to explore — monthly subscription or one-time unlock for the full catalog.