See the whole scale
Pick a key, scale, and tuning. Roots stay coral, scale notes stay quiet, and full-neck mode gives lead playing the entire fretboard.
Built for guitarists
Music theory, left open next to your guitar.
Not a course. Not a practice streak. Not a tool that wants to play for you. Fretboard Theory keeps the neck, chords, and progression in one clear view so the theory starts to stick while you actually play.
The real web app
A progression is already loaded.
Activate it, then press Play in the bottom-left. Change the key, move through the chords, or keep the loop running while you find the notes on your guitar.
No accountLocal browser stateAudio made on this device
Root
Scale note
Chord tone
12 scales
8 meters
1-12 strings
Why it is useful
It gives you the view, then gets out of the way.
You should spend more time looking at the guitar than the app.
Stay in one part of the neck
Choose a low, middle, or high position. As the chord changes, the app finds a playable shape in the same area.
Hear why the chords work
Build a progression, set the meter and rhythm, switch on the click, and let it repeat while your hands catch up.
It follows your choices
Change key without rebuilding the idea.
The progression transposes with you. Chord forms, timing, selection, and your preferred neck area stay intact.
Standard, Drop D, Drop C, DADGAD, Open G, seven-string, eight-string, bass, ukulele, and fully custom tunings are built in.
Installed library
28 starting points, when you want one.
The installed app includes a library organized with Rock first, then Roots and Traditional, Jazz and Soul, Classical, and Atmospheric guitar.
They are not backing tracks or finished songs. They are tasteful harmonic starting points you can transpose, reshape, and save as your own workspace.
See the installed appThe web app lets you preview the library. Opening a sample requires the installed app.
Desktop Dry DI
Use the amp you already like.
The installed desktop app can send a physically modeled dry guitar signal without an amp or cabinet. On macOS, route it through BlackHole and choose BlackHole as the input in your local amp simulator.
- No microphone permission
- Dual mono on channels 1 and 2
- String, fret, pick, strum, sustain, and palm-mute behavior
01Fretboard TheoryDry DI
→02BlackHoleVirtual cable
→03Your amp simYour tone
Web app
Free theory dashboard.
The neck, chord positions, progression builder, meters, click, custom tunings, and saved local workspaces are available in the browser.
Use it aboveInstalled app
Offline, with the full library.
Add all 28 starting points, a dedicated app window, offline use after installation, and native desktop Dry DI routing where supported.
See current downloadsCheckout and current platform downloads are handled by Gumroad.No app accountNo subscriptionNo ads or analyticsNo microphoneWorkspaces stay local
Made to be left open