Online Tuner

📖 About this tool

A guitar drifts out of tune after a week in its case, and a ukulele with new strings needs constant adjustment, which is awkward when no tuner is to hand. This tool listens through your computer or phone microphone, shows the nearest note name and how many cents you are off, and moves a needle left when you are flat and right when you are sharp, with centre meaning in tune.

It suits everyday tuning of guitar, ukulele, violin and bass, and for settling a shared pitch before a choir or rehearsal. The reference pitch can be set to 442 or 443 if that is what your ensemble uses rather than the usual 440.

Pitch is estimated by autocorrelation on each short block of audio, which is why a sustained single note gives a stable reading while chords do not. The needle damping control trades responsiveness against steadiness: low values react instantly and jitter, high values settle smoothly and feel slower. If the room is noisy, lowering the sensitivity keeps the display from latching onto background sound, and the optional noise gate shows you where that threshold sits so you can see why a quiet note is being ignored.

The display is built around a needle rather than numbers, because watching a needle centre itself is easier while your hands are on the instrument. Damping controls how quickly the needle reacts: low values respond instantly but jitter, high values settle smoothly and feel calmer. In a noisy room, lowering the sensitivity stops the reading from latching onto background sound, and the optional noise gate shows exactly where that cut-off sits so you can tell why a soft note was ignored.

✨ Features

• Live pitch detection: play into the microphone and see the note and the offset in cents.
• Needle display: left is flat, right is sharp, centre is in tune, no numbers needed.
• Five instruments: guitar, ukulele, violin, bass, plus chromatic.
• Adjustable reference: set A4 anywhere in the usual range for your ensemble.
• Sensitivity and damping: reduce sensitivity in noisy rooms, increase damping if the needle shakes.
• Noise gate: optionally show the level below which sound is ignored.
• Note chart export: save the note-to-frequency table for the current reference as CSV.

🚀 How to use

1. Click Start tuning and allow microphone access when the browser asks.
2. Select your instrument and, if needed, adjust the reference pitch for A4.
3. Play one note at a time into the microphone and let it ring for a second or two.
4. Watch the needle: left means flat so tighten the string, right means sharp so loosen it.
5. When the needle centres and the status reads In tune, that string is done.
6. Work through the strings, then click Stop and export the note chart if you want one.

⚠️ Notes

• Microphone permission is requiredThe browser will prompt you; without access there is nothing to measure, and a refusal must be undone in site settings.
• Single notes onlySeveral notes at once interfere with each other; tune one string at a time.
• Needs a quiet roomBackground noise causes false readings; lower the sensitivity if it is busy.
• Accuracy has physical limitsPitch comes from autocorrelation, which can struggle with very low notes or strong overtones; check with a dedicated tuner before a performance.
• Audio stays localSound is analysed on your device only, never uploaded and never recorded.