You already own the five minor-pentatonic boxes. The gap is hitting purposeful
notes — 3rds, 5ths and 7ths — right as the chord changes. This trainer keeps you
anchored in the box you choose and recolours the same notes to show their job
over the current chord.
How to use it
Pick the song key and one of the five pentatonic boxes. All shows the whole neck.
Single chord mode reads one chord; Progression mode steps through changes (←/→ keys).
▶ Play auto-advances at a tempo; turn on the click for a metronome.
Play along launches a track in the key; Find key looks a song's key up online and sets it.
The colours
Root — home, always safe.
3rd — the money note; defines major vs minor.
5th — stable anchor.
7th — the colour of the chord.
Spicy — tensions / blue notes. Use with intent.
Careful — clashes; pass through.
Passing — in the scale, neutral here.
Reach — a chord tone just outside the box.
Runs entirely in your browser. Song lookup uses an online service; everything else is local.
Suggest a change×
Jot anything you'd like changed or added — bugs, ideas, "make X bigger".
It's saved for whoever maintains the app to action. Works from your phone or PC.
Inspiration — what should I play?×
Type an artist, a song, or a style (blues, funk, metal, jazz…) and get ideas of what to play.
Theme×
Pick an amp cabinet (or acoustic). Saved on this device.
Tuner — standard tuning×
Tap a string to play its reference tone (one octave up, so it's clear on phone speakers) — tune your string to match. Tap again, or another string, to stop.