ToneTwinFree guitar tuner
Tune by ear no more. Play a string and the tuner shows the note and how many cents sharp or flat you are. Free, no sign-up, and your audio never leaves your device. Pick your tuning below.
Tuning
Tap start to tune
♭ flat—sharp ♯
E82 Hz
A110 Hz
D147 Hz
G196 Hz
B247 Hz
E330 Hz
Works best with a quiet room. Audio stays on your device, nothing is recorded or uploaded.
How to use the tuner
Tap Start tuning and allow microphone access. Pluck a single open string and let it ring. The big letter is the nearest note; the needle shows whether you're flat (left) or sharp (right). Turn the tuning peg until the needle sits in the centre and the readout turns green. For standard tuning the strings are E, A, D, G, B, e from low to high.
Want the exact tone behind a song once you're in tune? Browse the tone database.