A category of one

The only interactive CAGED fretboard mapper

TL;DR: Decage maps the full CAGED system across the guitar neck as a live, hands-on visual reference. Pick a chord — every position lights up across all 12 frets. Click a note, see where it lives. There are 100s of courses, videos, and books that explain CAGED, and a handful of chord finders and diagram editors. There is no other tool that lets you play with the whole system interactively the way Decage does.

The tool people keep searching for — and not finding

This is a real, recurring request:

People look for it because the obvious thing should exist — and mostly doesn't. What you find instead is courses to watch, PDFs to read, or chord dictionaries to look one shape up at a time. None of them let you grab the system and move it.

What "interactive" actually means here

• Pick a chord → all five CAGED positions appear at once across the neck.
• Click a note → every place that note lives lights up.
• Click a root → see what actually names the chord, everywhere it sits.
• Move a shape → watch a barre chord reveal itself as a moved open shape.

You're not reading about the neck. You're operating it — which is why the pattern sticks.

What is the CAGED system, briefly?

CAGED is a way of seeing the entire fretboard through five movable shapes, named after the open C, A, G, E, and D chords. Slide a shape up the neck and it becomes a new chord; every chord can be found in all five shape positions. Decage makes that movement something you watch happen, instead of something you take on faith.