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Tuner & metronome

Tuner

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Waiting for a note

Off by (cents)
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Heard
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Target
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Note
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Measuring pitch needs microphone access. The browser will ask when you press the button — choose Allow. Nothing is recorded or uploaded; the audio is only counted for its frequency. The metronome works without the microphone.
Hz

440 Hz by default. Orchestras often use 442, early-music groups 415 — match whoever you are playing with.

Metronome

Moderato
100BPM

Beats per minute, from 30 to 300.

The downbeat is higher and louder. Turn it off and every beat sounds the same.

%

If you do not know the tempo, tap this button along with the music four or five times and the BPM fills in.

Clicks are booked ahead on the Web Audio clock rather than fired from a browser timer, so the tempo does not drift when the page is busy.

To find the key or tempo of a recording, use the key & tempo changer (/audio/pitch-tempo)

Play a note into the microphone and read the note name, the octave and how far off it is in cents. The A4 reference is adjustable from 415 to 466 Hz, and the metronome runs without the microphone. Both work entirely inside the browser.

Questions

Which instruments does it work with?

Anything monophonic: guitar, bass, ukulele, violin, wind instruments and the voice. The detection range runs from roughly 27.5 Hz (A0) to 1400 Hz, which covers nearly the whole piano and the bottom of a bass guitar. Chords and two instruments at once cannot be measured — play one note at a time.

I refused the microphone prompt by mistake.

Open the padlock or camera icon at the left of the address bar, set this site’s microphone to Allow, and reload the page. On a phone the same setting lives in the browser’s site settings. Note that microphone access is only offered on encrypted (https) connections.

Is the audio recorded?

No. Samples from the microphone are used to count frequency and then discarded. Nothing is written to disk and nothing is sent to a server. Pressing "Stop the microphone" or closing the page ends the capture.

The metronome tempo feels slightly uneven.

The clicks are booked ahead on the audio clock, so the tempo itself does not drift no matter how busy the page is. The on-screen lamps do follow the display refresh, so in a background tab the lamps can appear to freeze while the sound carries on unaffected.

Will the tuner hear the metronome?

Not through headphones. Through speakers it can: the click is a clean tone and the tuner will happily measure it. Stop the metronome or turn it down while you tune.

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