Piano Tuner: Stretch & Unison

Piano tuning app: check all 88 keys against a stretch curve and tune unisons

Piano Tuner is a piano tuning app for owners who want to see which keys have drifted between technician visits. It listens through your phone's microphone, measures the string you play and compares it with a stretched target built from your own piano, not a plain chromatic scale.WHY A PIANO NEEDS A STRETCHED TARGETPiano strings are stiff, so their overtones sit slightly above whole-number multiples of the fundam…