Note Detector
Play or sing one note into your microphone and see which note it is, its octave, its frequency in Hz and how far it is from perfectly in tune. Free, instant and no sign-up.
Runs entirely in your browser. Your audio is never uploaded or recorded.
Key Features of the AirMusic Note Detector
What the note detector does, and what it does not.
Live Note Name and Octave
See the note you are playing, such as A4 or E2, update about twenty times a second while the note rings, so you can follow along as you move up and down your instrument.
Exact Frequency in Hz
Every reading shows the frequency to one decimal place, so you can compare a string, a reed or a pipe against a reference value, not just a note name.
Cents Tuning Meter
A needle shows how many cents the note is flat or sharp. It turns green within five cents of the target, which is close enough for most players to hear as in tune.
Low Notes to High Notes
The detector reads notes from the low E string of a guitar up through the top of a piano treble range, so guitar, ukulele, violin, flute and voice all work.
Runs in Your Browser
Pitch detection happens on your own device. Nothing is uploaded, nothing is recorded, and the tool keeps working on a slow connection once the page has loaded.
One Note at a Time
The detector is built for single notes. Strum a full chord and it may report one of the notes or nothing, so pick strings one by one when you check a chord.
Who Uses the Note Detector?
Real ways musicians put it to work.
Guitar and Ukulele Players
Pluck each open string and watch the needle to tune without a clip-on tuner. Players learning the fretboard can also press a fret, play it, and confirm which note sits there until the layout of the neck becomes second nature.
Piano and Keyboard Students
Play a key and see its name and octave. It is a quick way to check middle C, learn where each octave starts, or confirm the note you hear on an old piano that has drifted out of tune.
Learning Songs by Ear
Hum or play back a melody one note at a time to work out what it is. Writing down the note names as you go turns a tune stuck in your head into something you can play or notate.
Teachers and Classrooms
Put the detector on a projector and let students see the note they sing or play. A visible needle makes sharp and flat concrete, and it works on any laptop without installing software.
Why Use the AirMusic Note Detector?
Simple, private and instant.
Free and No Sign-Up
Open the page, allow the microphone and start. There is no account, no credit cost and no limit on how long you use it.
Private by Design
Audio is analysed on your device and never leaves it. Stop the detector and the microphone is released straight away.
Instant Feedback
Readings refresh about twenty times a second, fast enough to hear a note and see it on screen at the same moment.
Works on Phone and Desktop
Use it in a current version of Chrome, Edge, Firefox or Safari on a laptop or phone with a working microphone.
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How to Use the Note Detector
Three steps, no account needed.
Step 1: Allow the Microphone
Press Start Listening and allow microphone access when your browser asks. Use a quiet room and hold the instrument close to the mic.
Step 2: Play or Sing One Note
Let a single note ring for a second. The note name, octave and frequency appear in the middle of the card.
Step 3: Read the Needle
Adjust until the needle sits in the centre and turns green. Press Stop when you are done to release the microphone.
Note Detector FAQ
Common questions about the AirMusic note detector.
Find Your Note Now
Play or sing a note and see exactly what it is, live, with no account and no uploads.