Protect concentration
Increase sensitivity so even a modest rise in classroom sound wakes the kittens.
Free teacher tool
Classroom Noise Meter
Microphone is off
Calm visual signal · audio stays on this device
Match this room
At the sound level you hear now, how many kittens should be awake?
Start the monitor first, then choose.
No recordingNo audio files are created.
No accountOpen it and start the class.
Match the roomChoose how the kittens should look right now.
Smartboard readyLarge visual signal and full screen.
A calmer feedback loop
Built for what actually happens in a classroom
A classroom noise monitor should let students notice and lower their own volume without making the teacher repeat the same correction. Some reactive tools reward louder sound with more entertaining movement. These three kittens stay curled in one place; the number of awake kittens makes each sound stage readable without bouncing or spectacle.
Use the Cozy Kittens story when caring for sleepy animals helps younger learners understand the goal. Use Calm Signal for students who focus better with neutral feedback. Both views use the same four sound bands and adjustable microphone sensitivity.
One-minute setup
Set the expected volume for this activity
- 1
Enable the microphone
Your browser asks for permission. The meter reads live amplitude only; it does not record speech.
- 2
Try a normal classroom voice
Watch which kittens wake as the room moves through the four relative sound bands.
- 3
Adjust sensitivity if needed
Lower it if the microphone reacts too strongly, or raise it if the signal barely moves.
- 4
Put the signal on screen
Use full screen on a projector or smartboard so students can self-correct without interruption.
When to use it
Different activities need different definitions of “quiet”
Allow productive talk
Reduce sensitivity before students begin so ordinary conversation stays in a calmer signal band.
Set one visible expectation
Open the page on the classroom computer, start the microphone, and show the same neutral signal without creating an account.
See the room level
The large state, text label and band meter provide visual information without depending on an audible warning.
Local by design
The microphone is measured, not recorded
The browser supplies a live audio stream so this page can calculate changing volume. The page does not use a recorder, create an audio file, transcribe speech, or send microphone samples to a server. Selecting Stop ends the tracks immediately.
Read the microphone and privacy details →Questions teachers ask
Classroom noise meter FAQ
Does this classroom noise meter record students?
No. It reads changing microphone amplitude inside the browser and does not create, retain or upload an audio recording. Press Stop microphone to release the stream.
How do I match the meter to my room?
Start the monitor and choose how many kittens should be awake at the current sound. Then make the room noticeably louder or quieter and answer the “Now?” question. These two examples teach the meter both the starting point and the distance between sound stages.
Is the number a real decibel reading?
No. It is a relative classroom level. A browser and an uncalibrated laptop microphone cannot replace a certified sound-level meter for hearing-safety, workplace or regulatory measurements.
Do I need to understand the sound number?
No. The normal tool deliberately shows only the kitten state. Browser microphones cannot provide a trustworthy calibrated room-decibel reading, so the page does not present a technical number as if teachers need to interpret it.
Does it have an alarm or traffic-light view?
It uses a silent visual alert instead of playing a disruptive alarm. Choose Cozy Kittens for a child-readable wake-up signal, or select Calm Signal to show a green, amber and red classroom traffic light.
Will it work on a smartboard, Chromebook or iPad?
It works in modern browsers that allow microphone access. School browser policies can block microphone permission, so a teacher or administrator may need to allow this site for the device.