Custom noise meter
You’re watching a demo signal. Start to hear your room. Nothing is recorded.
Add the class mascot, a few drawings or everyone’s faces. When the room gets loud, they’re the ones that jump.
Why it works
Kids watch their own faces
A pile of anonymous balls is easy to ignore. A pile of the class’s own drawings, or the class pet, is not. Add up to three pictures and they become the balls (or float inside bubbles), driven by the same calibrated meter as every other style here.
Your pictures are cropped to a circle and shrunk inside this browser, then kept on this computer only. Nothing is uploaded, so you can use student photos without sending them anywhere. Remove them with one click.
Back row · ≈ 9 mFour scenes
Same room, different rules
Test
Noisy +5 · Too loud +10
Tests and silent reading. A whisper already counts.
Independent
Noisy +10 · Too loud +15
Quiet work time. Pencils and the odd question are fine.
Group
Noisy +15 · Too loud +22
Table talk at an indoor voice. Shouting across the room is not.
Free time
Noisy +20 · Too loud +28
Indoor recess, crafts and games. Only real chaos trips it.
In the room
Pictures that work in class
The class mascot
One picture repeated across the pile reads instantly from the back row. Keep the subject in the middle: the circle crop keeps the center.
Student drawings
Photograph three drawings on plain paper. Rotate the artists every week; it turns being quiet into a small honor.
Seasonal sets
Pumpkins in October, snowflakes in December. Close-ups on a plain background crop best.
Faces, with care
Ask before using student photos, even though they never leave your computer. Drawings and mascots avoid the question.
Same engine
Five more ways to show it
Classroom noise meter
A backlit VU meter with the scene’s lines on the face.
Open meter →
Bubble noise meter
Calm drift to a full boil. Best for the youngest.
Open bubbles →
Bouncy ball noise meter
A resting pile that jumps when the room gets loud.
Open bouncy balls →
Noise traffic light for classroom
Green, yellow, red. Nothing to explain.
Open traffic light →
Classroom noise monitor
Five minutes of history with scene lines and an alarm.
Open monitor →
Privacy
Nothing leaves this browser.
No recording
Sound is reduced to one loudness number about twenty times a second, then discarded.
No upload
Nothing is sent to a server. Load the page, unplug the internet, and the meter keeps working.
No account
No sign-up, no student data. Settings live in this browser only.
No tricks
We switch off the browser’s auto-volume so a loud room actually reads as loud.
Questions teachers ask
FAQ
Are my pictures uploaded anywhere?
No. Each picture is cropped and resized in your browser, then stored in this browser’s own storage on this computer. It is never sent to a server. Clearing your browser data or pressing Remove all deletes it.
How many pictures can I use?
Three for free, each repeated across the pile. Pro, $36 a year, raises that to thirty and adds a background picture and saved sets for each class.
Which images work?
Any photo your browser can open (JPG, PNG, WebP, GIF, and HEIC on Safari) up to 20 MB. A square crop is taken from the center, a little above middle for portraits, so keep the subject centered.
Will my pictures be there tomorrow?
Yes, on the same computer and browser. They are not synced: on the projector laptop, add them there. Private or guest windows forget them when closed.
Does it record my class?
No. Like every meter on this site, it turns sound into one loudness number at a time in your browser and throws the audio away.