One Tuner

OneTuner does one thing and does it well. Open the app, play a note, and instantly see if you're in tune. The screen shows your note in solfege notation with a precision needle meter. When you're in tune, everything turns green. When you're not, you see exactly how many cents sharp or flat you are. There are no menus, no settings to configure, no buttons to press. OneTuner starts listening the moment you open it and stops when you leave. It works with any instrument — guitar, piano, violin, cello, ukulele, flute, voice, anything that makes a pitch. No ads. No account. No subscription. No internet required. No data collected. Your audio never leaves your device. OneTuner is the tuner you open when you just want to tune and get back to playing.