Centerline: Guitar Tuner

About

A deliberately small guitar tuner. Open it, allow the microphone once, and tune. Five purposeful ways to read the same pitch, switchable at any time without replucking: Simple, an enhanced five-band Strobe, All Strings, Guitar, and Workbench. Standard tuning is free forever, with automatic string detection and every display. One purchase unlocks Drop D, Half step down, D standard, DADGAD, Open G, and the A4 reference. Pay once. No subscription. Your microphone audio stays on your iPhone and disappears as it is analyzed. There is no account, no ads, no trackers, and no Internet access of any kind.