Classroom Noise Meter
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How the noise meter works
The page listens through your device's microphone and shows the room's loudness as a big bar and a face. Green means calm, yellow means getting loud, and red means over the limit you set. Students see the change before you have to say a word, which makes quiet work feel like a shared goal.
Sound is measured in the browser and never recorded, saved or sent anywhere. The first time, your browser asks for permission to use the microphone; you can turn it off at any moment.
Set the limit for each activity
Drag the slider to choose the quiet level: low for silent reading or a test, higher for group work. The sensitivity setting adapts the meter to a big room or a laptop microphone far from the class.
An optional soft alert plays when the level stays above the limit for a few seconds, so short laughs do not set it off.
Pair it with a timer
Run the noise meter next to the classroom timer for a quiet-work block: ten calm minutes, then a break. Many teachers count the seconds spent in the green zone and turn them into a small class reward.
Preguntas
Does the noise meter record my class?
No. The sound level is measured live in your browser. Nothing is recorded, stored or uploaded.
Why does the meter ask for the microphone?
It needs the microphone to hear how loud the room is. If you deny access, the meter cannot show a level.
Is the reading in decibels?
It shows a relative loudness level, tuned for classrooms. Laptop and phone microphones differ, so use the sensitivity slider instead of exact decibel values.