Is any classroom audio recorded or sent to a server?

No. Quicklity uses the browser HTML5 Web Audio AnalyserNode to measure acoustic energy amplitudes strictly in local device RAM. No audio is ever recorded, stored, or streamed across the internet.

Can I adjust sensitivity for laptops with quiet microphones?

Yes. You can adjust the "Microphone Sensitivity" slider up or down to calibrate for your specific device hardware and room acoustics.

What decibel levels are typical for quiet study?

A quiet classroom or library typically measures around 45 to 55 dB. Group discussions usually register between 65 and 72 dB. Levels above 78 dB indicate shouting or commotion.

UtilitiesVisual Alert

Classroom Noise Meter & Traffic Light

Visual sound level traffic light indicator for teachers, classrooms, and study rooms using real-time microphone audio.

Traffic Light Signal

Classroom Sound Level

--dB

Microphone is inactive. Click Start below.

Yellow Warning Threshold65 dB

Turns the light yellow when classroom volume begins climbing.

Red Alarm Threshold78 dB

Flashes red light when noise exceeds acceptable classroom limits.

Microphone Sensitivity1.2×

Play Gentle Warning Beep on Red Light

How to Use Classroom Noise Meter & Traffic Light

Follow these simple steps to complete your task in seconds.

Grant Microphone Access

Click "Start Noise Meter" and allow browser microphone permission.

Set Yellow & Red Thresholds

Adjust the sliders to set the appropriate volume thresholds for your room.

Display on Projector or Screen

Project the traffic light on the classroom whiteboard to give students real-time visual feedback.

Why Choose Quicklity for Classroom Noise Meter & Traffic Light

Engineered for speed, privacy, and flawless conversion accuracy.

Visual Traffic Light System

Green (quiet), Yellow (rising noise), and flashing Red (too loud) lights that students recognize instantly.

Real-Time Audio Spectrum

Measures ambient audio levels smoothly using the high-performance browser Web Audio API.

Optional Chime Alert

Generates a soft gentle synthesizer tone whenever the room breaches the red threshold limit.

100% Client-Side Privacy

Audio streams are analyzed strictly in device memory. No voice or recordings are saved or transmitted.

Frequently Asked Questions about Classroom Noise Meter & Traffic Light

Everything you need to know about using this tool.

Teachers typically open this tool on a classroom smartboard or projector. Students can visually monitor their own noise levels during group work or silent reading, keeping the room calm without the teacher having to repeatedly shush.

Discover more free, fast tools for your daily workflow.

Web Audio