Chopinly › tools › Tuner

The tuner

Hear where you are. A chromatic tuner on your device's microphone, with a cents dial that settles rather than jitters.

Open the tuner free · no sign-up · works offline

What it does

Allow the microphone, play or sing a note, and the tuner shows the nearest note name, how many cents sharp or flat you are on a dial, and the raw frequency in hertz. The reference pitch A4 is adjustable from 430 to 450 Hz in half-hertz steps, with a one-tap reset to 440, so you can tune to an old piano, a baroque ensemble at 415 or a choir that has drifted.

How it listens

Pitch is found by autocorrelation on short windows of the microphone signal, the same method used in the sight-singing judge and the ear-training mic mode. The estimate is smoothed just enough to stop the dial shaking on a steady note without hiding a real wobble. Nothing is uploaded: the audio is analysed on your device and never leaves it.

What pianists use it for

A piano is tuned by a technician, not by its player, so a tuner in a piano app may look odd. In practice it earns its place:

• Singing. Sight singing and ear training both start with a note you have to produce, and the tuner tells you whether you are producing it. Warm up on it.
• Checking the piano's pitch. Play A above middle C and see whether the instrument sits at 440, or has sagged to 435 over a humid summer — useful to know before you set the metronome's or pitch pipe's reference to match.
• Other instruments in the house. Violins, guitars and ukuleles get tuned before the piano-and-something duet.
• Intonation practice for anyone who plays a string or wind instrument alongside the piano.

Details

• Runs in any modern browser with microphone access; works offline once loaded.
• No ads, no account, no tracking; audio never leaves the device.
• The A4 setting is shared with the pitch pipe and the piano so the whole case agrees on what an A is.