ToolPorch

ToolPorch / Classroom / Noise Meter

Noise Meter the class manages itself with

Put the room's volume on the board and let students self-correct. Everything is measured on your device — no audio is ever recorded or uploaded, full stop.

Press start
Privacy, plainly: the meter computes a single loudness number from the microphone stream, locally, dozens of times a second, and throws the audio away as it goes. Nothing is recorded, nothing leaves your device, and the mic stops the moment you close the tab. That's how a classroom tool should treat a room full of children's voices.

How to set it up for your room

During normal independent work, start the meter and drag sensitivity until the bar hovers around the middle of the green zone. Then set the too-loud line where your tolerance actually is — around 70% works for most rooms. Now the meter reflects your standards, not ours. The settings are saved on the device, so tomorrow it's one click.

Teachers who get the most out of a visible meter treat it as information for students rather than surveillance: "check the meter" replaces "quiet down," and the class learns to glance and adjust. It works because the feedback is instant, impersonal, and the same for everyone.

Frequently asked questions

Is the microphone audio recorded or sent anywhere?

No — and this is the most important thing to know about any classroom noise meter. Your browser measures the volume level locally, on your device, in real time. No audio is recorded, stored, or transmitted; the page works with the network cable unplugged. When you leave the page, the microphone turns off.

Why does it need microphone permission?

The meter reads loudness through your device’s microphone, so the browser asks for permission once. Choose "Allow" — you can revoke it any time from the address-bar padlock. If your district blocks mic access on student devices, run it on the teacher machine.

What does the sensitivity slider do?

Rooms and microphones differ enormously — a Chromebook mic three feet from a reading group hears differently than a desktop mic at the front. The slider scales the meter so "working hum" for YOUR room sits in the green zone. Set it during normal work time, then leave it.

What happens when the class is too loud?

The bar goes red and the screen border pulses. If you enable the chime, a soft bell plays when the room has been over the line for three seconds — long enough to ignore one dropped pencil, short enough to catch real chatter.

Does it work on a Chromebook?

Yes. Any device with a microphone and a browser works. Fullscreen it on the projector so the class can self-monitor.