How it works
- Press “Start tuning” and allow the microphone. Your browser asks for mic access once — the audio is analyzed locally and never leaves your device.
- Pick your instrument and play one string. Choose guitar, bass, ukulele or chromatic mode, then play a single string and let it ring.
- Read the needle and adjust. The needle shows your offset in cents: tune up if it sits left, tune down if it sits right — it turns green when you're in tune.
Features
- Guitar, bass, ukulele & chromatic. Standard tunings for guitar (E A D G B E), bass (E A D G) and high-G ukulele (G C E A), plus a chromatic mode for any other instrument or voice.
- Adjustable reference pitch. A4 defaults to 440 Hz and can be set anywhere from 415 to 466 Hz — handy for 432 Hz or orchestral 442 Hz.
- String-by-string guidance. Tap a string to lock the target, and each string turns green once it has been held in tune.
- Private by design. The microphone signal is analyzed locally in your browser — it's never recorded, stored or sent over the network.
FAQ
Is this online tuner free?
Yes, completely free and unlimited. The tuner runs in real time on your own device, so there is nothing to meter: no daily quota, no account, no watermark and no locked features. Open the page, allow the microphone and tune your instrument as often as you like.
Is my microphone audio recorded or uploaded?
No. The microphone signal is analyzed locally in your browser with the Web Audio API: each audio frame is processed on your device to extract the pitch, then immediately discarded. Nothing is recorded, stored or sent over the network — the page makes no network request with your audio.
Which instruments and tunings are supported?
Four presets are built in: guitar in standard tuning (E A D G B E), bass (E A D G) and ukulele with a high G (G C E A), plus a chromatic mode that detects the nearest note for any other instrument or for your voice. In instrument mode you can tap a string to lock the target.
How accurate is this tuner?
The detector uses autocorrelation-based pitch detection (YIN) with median smoothing, and shows your offset in cents — the display turns green within ±5 cents, tighter than most ears can hear. For best results, play one string at a time, let it ring out, and tune in a reasonably quiet room.
What is A440?
A440 is the standard concert pitch: the A above middle C (A4) vibrates at 440 Hz, and every other note is tuned relative to it. Some players prefer alternatives such as 432 Hz, or the 442 Hz used by some orchestras — this tuner lets you set the reference anywhere from 415 to 466 Hz.