Pitch Detector
This online pitch detector shows the note you sing, hum or play, its frequency in Hz and how many cents you are flat or sharp. Use it as a voice tuner to practise singing in tune, or to find the note of any sound. Press Start and allow the microphone.
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Sing, hum, whistle or play. The line shows your pitch over the last 8 seconds. Audio stays on your device.
- What it does
- Shows the note you sing or play with its octave, Hz and cents, plus an 8-second pitch line
- What it does not do
- Analyse audio files · detect chords · record audio
- Reference pitch
- A4 = 440 Hz, adjustable 415–466 Hz
- Tested with
- 58 studio recordings of 11 instruments (right note on about 95% of frames at normal volume) and test tones from B0 to C6
- Made by
- The Appcellent team
- Updated
- November 2026
Tuner not hearing you?
- Allow the microphone. If you blocked it: in Chrome or Edge, click the icon left of the address bar → Microphone → Allow, then reload. In Safari on iPhone, tap aA → Website Settings → Microphone → Allow. In Firefox, click the crossed-out microphone in the address bar. On a Mac, also check System Settings → Privacy & Security → Microphone for your browser.
- Open the page in Safari or Chrome. In-app browsers (Instagram, Facebook, TikTok) often block the microphone.
- Play one note at a time, louder. Sing toward the microphone from about an arm’s length. A quiet room helps.
- Wrong octave or jumping notes? Let the attack fade for a moment — the reading settles once the note is steady.
Use it as a voice tuner
Hold a note and watch the line: a flat, straight line means a steady pitch. Wobbles show vibrato or drifting. Try singing a scale slowly and stopping on each note until the cents read close to 0.
Note, frequency and cents
- Note — the nearest note name with its octave number (middle C is C4).
- Frequency — vibrations per second. A4 is 440 Hz; each octave up doubles the frequency.
- Cents — 1/100 of a semitone. ±5 cents is very close to in tune.
Tuning an instrument? The online tuner has string-by-string modes for guitar, ukulele, violin and bass.
Questions
How does a pitch detector work?
It listens through your microphone and measures how often the sound wave repeats (its frequency in Hz). That frequency is matched to the nearest musical note, and the difference is shown in cents.
Can I use it as a voice tuner?
Yes. Sing or hum a note and the detector shows which note you are singing and whether you are flat or sharp. The line graph shows how steady your pitch is.
Why does it show the wrong octave sometimes?
Some sounds, especially whistling, breathy singing or low hums, have weak or unusual overtones. Sing a little louder and steadier, closer to the microphone.
Can it detect chords?
No. It detects one note at a time (the strongest pitch). Play or sing single notes for accurate results.