Chromatic Tuner
Tune any instrument using your mic — see the note and cents in real time.
Microphone blocked 🔒
Allow mic access for this site (click the 🔒 / camera icon in your address bar), then press Start tuner again.
Mic tuning isn't available here
Your browser doesn't support live audio input (or the page isn't on HTTPS). You can still tune by ear — pick an instrument below and tap a string to hear its reference tone.
Couldn't start the microphone
Chromatic mode detects any note across the full range — great for piano, vocals, brass and more.
100% private — audio is analysed on your device and never leaves your browser.
Best with a quiet room and the instrument close to the mic. Green needle = in tune (±5¢).
Why you’ll love Chromatic Tuner
Instant & free
No signup, no paywall, no limits — Chromatic Tuner works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Instant sound
Plays in real time in your browser via the Web Audio API — headphones recommended.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
About Chromatic Tuner
This is a free chromatic tuner that listens through your device's microphone and shows the note you are playing, its exact frequency in hertz, and how many cents sharp or flat you are on a live needle. It has built-in string maps for guitar (standard EADGBE, Drop D and half-step-down), bass, five-string bass, ukulele, violin, cello, mandolin and banjo — or you can leave it in Chromatic mode to tune piano, vocals, brass and anything else across the full range. All audio is analysed on your device and never leaves the browser.
Under the hood the tuner uses a pitch-detection method based on the normalized square-difference function — the McLeod Pitch Method — which autocorrelates the incoming waveform to find its fundamental period. That approach is deliberately octave-safe, so a bright, harmonic-rich string does not trick it into reading a note an octave too high. A window of ±5 cents counts as in tune, and the needle turns green the moment you land there.
Every note frequency is derived in twelve-tone equal temperament from a reference A4, which defaults to the modern 440 Hz standard but slides from 415 to 466 Hz — so you can tune to 432 Hz, orchestral 442, or match an out-of-standard piano. Cents are hundredths of a semitone, with 100 cents between adjacent notes, which is why the meter can tell perfectly in tune from a few cents off. If your browser blocks the mic, you can still tune by ear using the built-in reference tone for each string.
Popular uses
Frequently asked questions
Accuracy comes down to a clean signal and a good pitch-detection algorithm. This tuner analyses the raw waveform with the McLeod Pitch Method, refines the result with parabolic interpolation for sub-cent precision, and reads a ±5-cent window as in tune. For best results keep the room quiet, play a single string, and hold the instrument close to the mic.
A cent is one hundredth of a semitone, so there are 100 cents between two neighbouring notes. The number tells you how far off pitch you are and in which direction: a negative value means you are flat (tune up), a positive value means you are sharp (tune down), and anything within about five cents shows as in tune.
A4 = 440 Hz is the modern standard and the default here, and it is what you want for playing with most recordings and other instruments. Some players prefer 432 Hz for its slightly warmer feel, and orchestras often use 442. The calibration slider covers 415 to 466 Hz, so you can match whatever reference your situation calls for.
It includes preset string maps for guitar in standard, Drop D and half-step-down, four-string and five-string bass, ukulele, violin, cello, mandolin and banjo, each with tappable reference tones. Chromatic mode detects any note in range, which makes it just as useful for piano, vocals, harmonica and brass.
No. The microphone stream is processed entirely on your device using the Web Audio API, and nothing is recorded, stored or sent anywhere. When you stop the tuner the mic is released. That is why it works even on a flaky connection once the page has loaded.
Chromatic Tuner is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Browsers require a single tap before playing audio. After that first tap, everything works instantly.
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