String Setter support

String Setter is a single screen, shaped like a guitar, for tuning one.

Tuning at the top picks the tuning: standard, half and full step down, drop D and C, open E, D and G, and DADGAD. The pegs relabel to match.

Pegs choose the string to tune. Pluck it and read the sound hole: the needle shows where the string is, flat to the left and sharp to the right, and the label across from it says which way to turn: Tighter when the string is low, Looser when it is high. The scale spreads out near the mark, so the needle moves fast while the string is far off and slows down as it gets close. Within 4 cents the note turns green and the phone gives one tap.

A string an octave away, or more than a fifth off, is called out as the note heard (“Hearing D3”), so a string in the wrong octave never shows as in tune.

Chromatic on the bridge names any note you play, octave included, with the needle reading flat and sharp.

Phone microphones hear little of the lowest strings, so let other strings stop ringing before you tune, especially one an octave away from the string you are on.

The screen stays on while the app is open.

Requires an iPhone with iOS 26 or later.

Contact

Questions or problems: rafal@radziszewski.software