RoomTone
Free classroom noise monitor

Show the room when it gets loud.

Start the microphone, choose an activity, and project a clear traffic light your class can follow.

Classroom monitor

Audio stays on this device

Ready when you are

Start the room check

0relative level
No recording, no upload
ComfortableRising at 44Too loud at 66
No recordingsAudio never leaves this device.
Projector readyFullscreen words, shapes, and color.
Tuned to your roomPresets plus simple threshold controls.
How it works

Ready before the class settles in.

There is no account or setup wizard. Pick the activity and start.

  1. 1
    Choose the activity

    Silent work, partner talk, or group work sets a useful starting range.

  2. 2
    Start the microphone

    Your browser measures loudness locally. It does not record speech.

  3. 3
    Put it on the board

    Students see when the room is comfortable, rising, or too loud.

A shared cue, not a sound lab.

Every laptop microphone hears a room differently. RoomTone shows a stable relative level, not certified dB SPL. Set it while the activity sounds right, then let the traffic light do the reminding.

Read the classroom setup guide
ComfortableKeep going
Voices risingBring it down
Too loudPause and reset
Privacy

The microphone is a meter. Nothing more.

RoomTone reads short waveform samples in the browser, calculates their relative loudness, and discards them immediately.

  • No recordings or playback history
  • No speech recognition or student profiles
  • No audio uploads to a server
See the full privacy explanation
Teacher questions

Before you put it on the board.

Is this classroom noise monitor free?

Yes. The live monitor, activity presets, traffic light, fullscreen view, and optional alert are free and require no account.

Does RoomTone record students or classroom conversations?

No. Your browser reads the microphone's moment-to-moment volume locally. RoomTone does not create recordings, send audio to a server, or store microphone samples.

Is the number a real decibel reading?

It is a device-relative classroom level based on the microphone signal, not a calibrated sound pressure level (dB SPL). Microphones and automatic gain differ, so tune the thresholds for your room.

Can I show the monitor on a projector or classroom display?

Yes. Use Fullscreen for a large, glanceable green, yellow, or red signal. The status also uses words and symbols so students do not need to distinguish color alone.

What happens when the classroom gets too loud?

The monitor enters a red Too loud state. You can optionally enable a gentle, rate-limited chime, or keep it completely visual and silent.

Why does the meter react differently on another device?

Laptop, tablet, and external microphones have different sensitivity and gain control. Place the device near the teaching area, choose a preset, and adjust sensitivity and thresholds during typical activity.