Sing or hum any note and the voice tuner shows its name, octave and frequency in Hz, plus a needle that tells you how many cents sharp or flat you are. Free, no sign-up, and it runs in your browser.
How it works
No setup beyond allowing the mic. A quiet room and a steady “ah” give the cleanest reading.
Step 1
Press Start tuner and allow microphone access. Leave the reference at A4 = 440 Hz unless your choir, piano or band tunes to 442 Hz, which some orchestras and ensembles use.
Step 2
Sing or hum a single note on an open vowel and hold it for a second or two. The big letter shows the nearest note and its octave, with the exact frequency in Hz underneath.
Step 3
The needle shows how far you are from that note, up to 50 cents either way. Adjust until it turns green, within 10 cents, then check the pitch trail and recent notes to see how steady you were.
Quick reference
Landmark notes across the singing range at standard tuning (A4 = 440 Hz). Each octave up doubles the frequency.
| Note | Frequency | Where you meet it |
|---|---|---|
| E2 | 82.4 Hz | Bottom of a typical bass range |
| A2 | 110 Hz | Bottom of a typical baritone range |
| C3 | 130.8 Hz | Bottom of a typical tenor range |
| C4 (middle C) | 261.6 Hz | Bottom of a typical soprano range |
| A4 | 440 Hz | The standard tuning reference |
| C5 | 523.3 Hz | The tenor’s “high C” |
| A5 | 880 Hz | Top of a typical mezzo-soprano range |
| C6 | 1,046.5 Hz | The soprano’s “high C” |
Notes use scientific pitch notation, where C4 is middle C. A semitone is 100 cents, so a reading of +25¢ is a quarter of the way to the next note up. With A4 set to 442 Hz, every frequency is about 0.45% higher, roughly 8 cents.
Highlights
Everything you need to check a note at a glance, updated many times a second.
The nearest note appears in large type with its octave number, so you can tell an A3 from an A4 at a glance. The exact frequency sits underneath, which is handy when a teacher, app or chart talks in Hz rather than note names.
The needle covers half a semitone either side of the note. Once you hold a note steadily within 10 cents, the display turns green and says In tune. Outside that, it tells you to go up or come down a little.
A live line traces the last few seconds of your voice, so you can see scoops, wobble and vibrato. Every note you hold steady joins a recent-notes row, a quick way to check a scale or the first notes of a song.
The voice tuner runs entirely in your browser. Your audio is analyzed on your device and never recorded or uploaded, there is nothing to install, and it works on phones, tablets and laptops with a built-in or USB mic.
Every sung note has a fundamental frequency: the number of times your vocal folds open and close each second. A voice tuner listens for that repeating pattern, measures it in hertz and finds the nearest note on the piano. The gap between your pitch and that note is shown in cents. There are 100 cents in a semitone, so 10 cents is a tenth of the way to the next key.
A voice is harder to read than a guitar string. Breathiness, vibrato and the bright overtones in your sound can all fool a simple detector, and the most common mistake is reading a note an octave too high or too low. This tuner accepts only clear, periodic sound, smooths out sudden octave jumps, and waits about a third of a second before it calls a note steady.
Most singers use it the same way: hold a note, look, adjust, look away and try again. It works for notes from about 50 to 2,000 Hz, which covers every singing voice from a deep bass to well past soprano high C. If you want your speaking pitch rather than sung notes, the voice pitch test averages your natural talking voice instead.
A vocal pitch finder is most useful when you give it a specific job. Try these short drills as part of your warm-up or practice, two or three minutes each. Keep the volume comfortable throughout: pushing harder tends to make notes go sharp, and it tires your voice before the useful work is done.
Once a note feels easy, close your eyes, sing it, then open them and check. Building the feel for a note without watching the needle is what carries over into real songs. When you're ready for melodies, the singing test plays a short phrase, has you sing it back and scores every note, and our guide on how to sing in tune turns drills like these into a 10-minute daily plan.
Last updated October 21, 2026
Use cases
Anyone who wants to see their pitch instead of guessing at it.
Check sustained notes, scales and tricky intervals, and catch the habit of scooping up into notes from below.
Find your starting note, hold your part steady and check that the group hasn't drifted flat during a long piece.
Show students exactly where a note sits, in cents, instead of describing it as a little high or a little low.
It reads any instrument that plays one note at a time, like violin, flute, trumpet or a single guitar string.
FAQ
Short answers about notes, cents and accuracy.
Still have a question?
The quickest way to find out is to try it yourself. It only takes a minute.
Sing a note, read it, fix it. Free, no sign-up and nothing to install.
