How to use the classroom noise meter
- Press Start listening and allow microphone access. Put the device where it can hear the room, and show the page on the board in full screen.
- Choose the noise level you want for the activity, from whisper-quiet for silent reading to lively for group work. Adjust sensitivity to suit your room and microphone.
- The face, colour and bar react to the noise. Optionally turn on a gentle beep when the class goes over the limit, and use the "quiet for" timer as a challenge.
Managing noise without shouting
A visual noise meter gives children instant, neutral feedback: instead of the teacher repeatedly asking for quiet, the class can see when the volume creeps up and correct it themselves. Agree the target level before each activity, explain what each colour means, and praise the class when they stay in the green. Many teachers turn the "quiet for" time into a game, rewarding the class when it beats a target, which works better than punishing loud moments.
The meter shows a relative level from 0 to 100, not calibrated decibels: phone and laptop microphones vary, so use the sensitivity slider rather than relying on absolute numbers. Sound is analysed live in the browser with the Web Audio API; no audio is recorded, stored or sent anywhere, which matters in schools. It also works for open-plan offices, libraries and home study spaces.
Does it record the class?
No. It only measures the volume in real time on your device. Nothing is saved or uploaded.
Is it measuring decibels?
It shows a relative level. Consumer microphones are not calibrated, so use it as a guide rather than a sound-level meter.
Why does the bar not move?
Check that the browser has microphone permission and that the right microphone is selected, then raise the sensitivity.