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Classroom Noise Meter

Free classroom noise level meter: a live traffic light powered by your microphone with adjustable green/red thresholds, an optional too-loud buzz, and an ad-free fullscreen mode. Nothing is ever recorded.

Stop Saying “Shhh” — Let Them See It

Noise creep is invisible to the people making it. A noise meter on the projector externalizes the problem: the class watches their own volume as a traffic light, and quieting down becomes a game of keeping the circle green instead of a confrontation with the teacher. Set the thresholds once for the activity — silent reading, partner talk, group work — and let the light do the reminding.

Private by Construction

A tool that listens to a classroom must be boring about privacy, so this one is: the audio stream is reduced to a single loudness number dozens of times per second inside your browser and immediately discarded. No recording, no storage, no upload, no account — and the microphone indicator in your browser tab shows exactly when it is active. Press Stop or close the tab and it is released.

Threshold Recipes That Work

  • Silent work / test: green to 25, red from 55, sensitivity 6 — even whispers show as amber.
  • Partner talk: green to 40, red from 75 — conversation lives comfortably in amber.
  • Group projects: green to 50, red from 85, alert buzz on — only genuine chaos trips the light.

Pair it with the classroom timer for timed quiet blocks, or the scoreboard to award table points for every five minutes the class keeps out of the red.

Frequently Asked Questions

Does the noise meter record my classroom?

No. The microphone audio is analyzed live inside your browser to compute a single loudness number, then discarded instantly — nothing is recorded, stored, or sent to any server. Close the tab or press Stop and the microphone is released.

How do I show it on the smartboard or projector?

Start the meter, then click Present Fullscreen: the traffic light grows to fill the screen with no ads, readable from every desk. The circle turns green when the class is quiet, amber at working volume, and red with a "Too loud!" label when they cross your threshold.

What do the green, amber, and red levels mean?

You decide — the two sliders set where green ends and red begins on a 0–100 scale. A common setup: green up to 30 for silent work, red from 70. For partner work, slide the red threshold higher so normal discussion stays amber.

The needle barely moves (or is always red) — how do I fix it?

Use the sensitivity slider: laptop microphones vary a lot. Raise sensitivity if normal talking barely registers; lower it in small or echoey rooms where everything reads loud. The setting is remembered for next lesson.

Can it make a sound when the class gets too loud?

Yes — enable the red-alert buzz and the meter plays a short low tone each time the level crosses into red (at most once every couple of seconds). Many teachers prefer it off, letting students self-monitor by watching the light.

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