Theory tools
Ten tools to explore music theory on the fretboard and tone building, computed on the fly, no account or saving needed.
This page gathers every interactive music-theory tool on the site: fretboard, scales, chords, keys. It's for anyone who wants to understand the "why" behind a sheet rather than just play it without asking — why this scale works over that chord, where the same shape shows up elsewhere on the neck, which keys resemble each other. Each tool computes its result live from a theoretical formula, with no pre-stored position database, and with no account or saving: nothing is lost when you close the tab, but nothing carries over between visits either.
Circle of fifths
Visualize major keys and their relative minor, with direct access to sheets in each.
Octave visualizer
Find a specific note across the 6 strings and the first 12 frets.
Compatible chords
Choose a chord: discover every other chord that naturally works with it.
Scale library
Browse 10 scale types across 12 keys, with 5 computed positions for each.
Power Chords Guitar Chart – All 12 Diagrams & Fingerings
All 12 power chords, one easy-to-move shape across the whole fretboard.
CAGED system
See how the 5 shapes C, A, G, E, D let you play the same chord anywhere on the neck.
Chord comparator
Place two chords side by side to compare their fingerings at a glance.
Scale finder
Check a few known notes, instantly find the scales that contain them.
Open chords poster
Display or print the most common open chords, all at a glance.
Effects Pedal Chain
Discover the reference order for a pedal chain, and test your own.
How to read this page
The tools fall into two families. Some show you where a note, position or key sits — octave visualiser, scale library, circle of fifths, CAGED system, explorable fretboard. Others help you choose or compare — chord comparator, compatible chords, scale finder. There's no required order: each tool stands on its own, pick the one that answers the question you actually have.
Practical tips and things to watch for
- If you're just starting out, begin with the circle of fifths or the octave visualiser rather than the comparison tools: they lay down the reference points the other tools already assume you have.
- The explorable fretboard and the chord library overlap but answer two different questions — "which chord lives where on the neck" versus "what does this exact chord look like" — no need to pick one, they complement each other.
- No tool needs an account or saves anything server-side: what you see depends purely on what you select right now.
- Every tool links back to real catalogue sheets: follow them to see the theory applied to an actual exercise instead of staying on the tool alone.