Tap the chord you're stuck on.

Every guitar app can show you a scale. None of them know your song. This one does.

Where you are

That's the four chord.

A chord on its own is a shape. A chord in a key is a decision.

What else fits

Anyone can look up what's in a key. Your song has used four of them. Here are the rest.

For whatever you play

A lead wants the box. A bass wants where the root goes. A singer wants the note that won't clash. Same chord, three answers. You get all of them.

Honest about what it knows

Borrow a chord from outside the key and it won't pretend to number it. Harmony notes come from the chord, not your melody — and they say so.

No waiting, no cost

One right answer, worked out rather than predicted. Nothing leaves your phone. Works with no signal.

And when it can't help

Some questions aren't arithmetic. Does this bridge work? The people you play with are already here.