Instrument tuner

This is a chromatic tuner: it names whichever of the twelve notes sits nearest and reports the distance in cents, equal tempered, against your A4 calibration. It handles one note at a time; chords and double stops break single-pitch detection, and noisy rooms can drop the reading out. The microphone is analyzed a few times a second, never recorded, and no audio leaves the device. Reference tones are synthesized here and pause while the tuner listens, so it never tunes against its own sound. The tool does not transcribe melodies, tune to custom temperaments, or replace a strobe service on a grand piano.