01
Speaker Test
Plays test tones through the left, right and both channels so you can confirm every speaker is…
Pitch Detector
Listens through your microphone and shows the note being played, its frequency, and how many cents sharp or flat it is.
Audio Tests
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The test starts automatically — follow the prompts above.
In short
Within ±5 cents is in tune by any practical standard — a cent is a hundredth of a semitone, and almost nobody can hear a five-cent error on a single note. The reference pitch matters more than people expect: A4 is 440 Hz by convention, but many orchestras tune to 442 or 443, so a piano tuned to 442 reads consistently sharp against a 440 reference while being perfectly in tune with itself. Detection works by autocorrelation, which follows one note at a time — a chord, two instruments together, or a very breathy sound will not give a stable reading.
How to use the Pitch Detector
- Allow microphone access.
- Play or sing one steady note.
- Read the note, then the cents.
- Adjust the reference if your ensemble tunes above 440.
About the Pitch Detector
The Pitch Detector listens through your microphone and shows the note being played, its frequency, and how many cents sharp or flat it is. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Tuning an instrument without an app.
- Finding out what note a sound is.
- Checking whether a recording is at concert pitch.
Details
| In tune | Within ±5 cents |
|---|---|
| A cent | One hundredth of a semitone |
| Concert pitch | A4 = 440 Hz, though 442 and 443 are common |
| Method | Autocorrelation with parabolic interpolation |
| Range | Roughly 40 Hz to 4 kHz |
The frequency reading uses parabolic interpolation around the correlation peak rather than the peak sample itself. Without it the result quantises to whole samples, which at 44.1 kHz is several cents of error in the upper register — enough to make a perfectly tuned violin read flat.
Where this tool stops
One note at a time. The very bottom of a bass guitar is at the edge of what a laptop microphone reproduces at all, so a poor reading down there is often the microphone rather than the instrument.
Frequently asked questions
How close is close enough?
Within five cents is in tune for any practical purpose. Ten cents is audible to a trained ear on a sustained note against a reference; twenty is audible to anyone. Chasing zero is pointless on most instruments, because temperature and playing pressure move the pitch by more than that during a piece.
Why does my reading jump around?
Autocorrelation follows a single periodic sound. A chord gives it several competing periods, a breathy or percussive note gives it none, and room noise adds a floor it has to see past. A steady sustained note is what it is built for.
Why 442 instead of 440?
Because orchestras choose their own pitch, and many European ones sit at 442 or 443 for a brighter sound. Neither is more correct. What matters is that everyone plays to the same one — so set the reference to your ensemble's pitch before deciding anything is out of tune.
Do I need an account to use the Pitch Detector?
There is no cost and no cap. The Pitch Detector is not a demo of a paid product, so nothing is held back or watermarked.
Is the Pitch Detector safe to use with private information?
No. The Pitch Detector runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What do people use the Pitch Detector for most?
Typical uses: tuning an instrument without an app. Finding out what note a sound is. Checking whether a recording is at concert pitch. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What are the limits of the Pitch Detector?
One note at a time. The very bottom of a bass guitar is at the edge of what a laptop microphone reproduces at all, so a poor reading down there is often the microphone rather than the instrument. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the reference figures here?
In tune is Within ±5 cents. A cent is One hundredth of a semitone. Concert pitch is A4 = 440 Hz, though 442 and 443 are common. These are printed on the page itself, so you do not have to take them on trust.
Do I need to install anything to run this test?
No installation, no extension and no driver. The Pitch Detector uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
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