1
Open the dock and tap Noise Meter
Allow microphone access and it starts listening straight away.
The dock · Keep calm
Noise Meter
The class watches its own volume — you retire from shushing.
The mic listens, the meter shows the room exactly how loud it is, and a bell rings if the line gets crossed. Noise management moves from your voice to the board.
Also called: sound level meter · volume monitor · decibel meter
- Free for teachers · no login required
Lovely and quiet ✨
Nothing is recorded — the level meter runs entirely on this page.
How it works
Three steps, zero setup
No setup screen, no import wizard — Noise Meter lives on the same board as everything else and it's running before the class has sat down.
2
Set the threshold
Slide the limit to match the activity — silent reading sits low, group work gets headroom. Sensitivity is adjustable too.
Let the room self-regulate
Pick the gauge or the bouncy balls. When the noise crosses the line, a bell sounds and the counter ticks up.
Classroom ideas
Try it tomorrow
Three ways teachers actually run noise meter — steal one for tomorrow morning.
Guided reading insurance
Threshold low, bouncy balls on, and the rest of the room self-referees while you focus on your small group.
The volume contract
Agree the line with the class before group work starts. When the meter's the referee, crossing it isn't an argument with you.
The whisper challenge
Can the whole tidy-up happen without ringing the bell once? Instant game, zero prep, suspiciously clean room.
The noise meter alone changed my afternoons. My Year 2s watch it like a game and keep themselves quiet — no nagging from me.
Same dock, one tap away 
Pairs well with
Every tool lives on the same board — these turn noise meter into a whole routine.
…and the rest of the dock is one tap away:
FAQ
Good to know
Does it record the class?
No — it measures how loud the room is in the moment to move the meter. It's a level gauge, not a recorder.
What are the display modes?
A gauge, or a pile of bouncy balls that jump higher as the room gets louder. The balls win with younger classes, every time.
Can I change the alert?
Yes — pick the sound, add a short delay so one dropped pencil doesn't ring the bell, or turn alerts off and let the visual do the work.
Will it work with my classroom mic?
It uses whichever microphone your device has, and you can choose between mics in settings.
Do I need an account to try it?
No — open a board, allow the mic, done. No login, no install; an account is only for keeping boards across devices.
Put a noise meter on your board
Open a board, tap the dock, and it's there. That's the whole setup.