Enter a chord progression, then arrange its notes on a piano-roll grid: double them, drop them or add colour notes, voice by voice. The app works out guitar shapes for exactly those notes, warns about anything hard or impossible to play, and can suggest a tuning that makes it easier.
Click a cell to add or remove a note; scroll the grid up and down to reach the whole guitar range. Tinted rows are the chord's own notes (colour = R / 3rd / 5th / 7th); notes outside the chord show as outlined colour tones. Shaded rows are out of reach in the tuning below. Each column's badge says whether its notes can be played together.
Keeps your exact notes and looks for a tuning (and capo) that makes them easier to finger.