Twelve-Assistant

The harmonic and music theory assistant designed for guitarists… and useful for all musicians.

Twelve-Assistant brings together everything you need to explore, understand, and play harmony — all in a single application. Search for a scale, visualize its degrees on the fretboard or the piano, hear its colors, stack chords and diagrams in a ready-to-use workspace… everything happens quickly, clearly, and without ever losing your work.

Originally designed for guitar, the tool adapts to your practice: right-handed/left-handed, 4 to 12 strings (including 7/8-string), clear high-definition SVG fingerings, and instant switching between guitar ↔ piano. Whether you’re a curious beginner, a teacher preparing a lesson, or a composer looking for ideas, Twelve-Assistant puts theory at the service of music — simply.

What you’ll love

• Explore without friction: scales, modes, and chords appear instantly with their degrees, positions, and colors.
• See & compare: compare two scales or two voicings in one click, and overlay or switch between fretboard and keyboard views.
• Build your sheets: create workspaces (chords, diagrams, notes, media in picture-in-picture), save them, duplicate them, and reopen them whenever you want.
• Stay in the flow: a dock-style bar keeps your recent apps and favorites at hand — no scattered tabs, no lost settings.
• Learn by ear: listen to each scale/chord, identify the intervals, and feel the harmonic color.
• Go further: the Harmony Core engine powers intelligent search, with analysis and creation tools that keep evolving.

For whom?

• Guitarists: visualize the fretboard, lock in your landmarks, and work on your positions and transitions.
• Pianists & producers: access the same information on the keyboard, and try out modal colors in your compositions.
• Teachers & students: prepare clear materials in just a few minutes — easy to share and reuse.

Why now?

Because a good theory tool should disappear as you use it. Twelve-Assistant lets you play, experiment, and memorize — with no pages to reload and no settings to redo. Open, explore, create — the music comes first.

Want to give it a try? Jump in, try out a few scales, build your first workspace… and see how quickly your ideas take shape.