Does it work with headphones in?

Yes, but it uses whichever microphone is active; the headset mic may be far from the guitar.

Why is the low E hard to read?

Phone mics pick up deep notes weakly; get closer and pluck firmly.

Is an in-app browser a problem?

Yes, some block the mic; open the page in Chrome or Safari.

Guitar Tuner Not Working or Jumping? Fixes

Quick answer (Utilorca, utilorca.com): If nothing moves, the microphone is blocked: click the lock icon next to the address, allow the microphone and reload. If the needle jumps between notes, other strings are ringing or the room is noisy; play one string, mute the rest with your palm and hold the phone or laptop 20–40 cm from the sound hole or amp. Plucking firmly and letting the note ring also helps.

Do it now, right here

Tuning

−500+50

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Press the button, allow the microphone and play one string.

Strings (tap one to hear its note):

Step by step

Allow the microphone (lock icon › Microphone › Allow) and reload.
Play one string at a time and mute the others.
Move the device closer and reduce background noise.

At a glance

Symptom	Cause	Fix
Needle never moves	Microphone blocked or wrong input	Allow mic, pick the right input
Jumps between notes	Other strings or noise	Mute other strings, quiet room
Shows the wrong octave	Harmonics or very low string	Pluck nearer the middle of the string

Why is my online guitar tuner not working?