Press play and allow the microphone
The browser asks once. On a smart board or a laptop with a webcam, pick the right microphone in the list under the meter — the choice is remembered on that device.
Want more characters and backgrounds?
If enough teachers ask, we’ll build them.
Thanks — counted!
How to use it
How to use the online noise meter in 3 steps
Put it on the big screen
The round button top-left switches to fullscreen, and the screen stays awake while the meter runs. Press pause to switch the microphone off.
Let the class watch the cat
As the room gets louder the cat covers its ears and the park turns into a busy airport. Use the settings (top-right) to adjust the sensitivity so normal work stays in the green.
FAQ
Frequently asked questions
About the free online noise meter
Is the online noise meter free?
Yes, the online noise meter at keepquiet.app is free: no sign-up, no ads and no time limit. The free set is one character and one scene; more characters and backgrounds will follow if enough teachers ask for them.
Does it record audio?
No. Audio never leaves your device — sound is analysed in the browser, nothing is recorded, stored or sent. We count anonymous page views and clicks (TelemetryDeck, no cookies), never sound. Pressing pause switches the microphone off.
Which browsers and devices does it work on?
It works on Chromebook, Windows, Mac and iPad in a current browser (Chrome, Edge, Safari or Firefox) and needs a microphone. The page must be opened over https (keepquiet.app is), and the browser will ask once for microphone permission. On a managed school Chromebook the microphone can be blocked by policy; the IT admin can allow it for keepquiet.app.
Why does my smart board pick the wrong microphone?
Interactive boards often have several microphones (the board itself, a webcam, the connected laptop) and the browser starts with the default one. Choose the right one in the Microphone list under the meter; the choice is remembered on that device. If the meter does not react, try another entry in the list or check that the microphone is not muted in the system settings.
Can I get it as an app?
Yes. Noise Meter – Keep Quiet is the same noise meter as an app for iPhone, iPad and Mac, free to download with no ads. The app adds a quiet-time timer, more characters and scenes, and works offline. There is no Android app; on Android, Chromebook and Windows use the free online noise meter. Get it on the App Store →
About the app
What is a visual noise meter for kids?
A visual noise meter turns sound into something children can see. Keep Quiet uses the device microphone to measure the room's volume in real time: a friendly character changes expression, the scene shifts colour, and a green-to-red dial or bar shows how loud things are — so kids can lower their own volume without being told. It is available as a free online noise meter in the browser and as the Noise Meter – Keep Quiet app for iPhone, iPad and Mac. Learn more →
How do I monitor noise levels in my classroom?
Open the free online noise meter on the classroom screen, or the app on an iPad mirrored to the whiteboard, pick a character, and let the class watch. As chatter rises the character reacts and the meter climbs toward red, prompting students to self-correct — no shushing needed. Learn more →
How can I get kids to be quiet without yelling?
Replace verbal reminders with a visual cue. When children can see the noise level — and a character reacting to it — staying quiet becomes a game of keeping the character happy rather than obeying an instruction. Learn more →
Does the app have a quiet time timer?
Yes, the app has a quiet-time timer. Set a quiet-time goal — say, ten minutes of reading — and the timer runs while the meter shows the live noise level, turning quiet time into a challenge kids can win. The online noise meter has no timer yet; a classroom timer is planned as a separate free browser tool. Learn more →
Is it suitable for autistic children and sensory-friendly spaces?
Yes. Gentle visuals, colour feedback that never punishes, reduced-motion and high-contrast accessibility support, dark interface, and no ads or interruptions make it a good fit for sensory-friendly rooms. The online noise meter respects the reduced-motion setting of the device too. Learn more →
How loud is too loud for a classroom?
Focused work is comfortable around normal-conversation levels or lower; sustained loud noise makes concentration and reading harder. Every room differs, so the meter shows the level at a glance and lets you set the sensitivity so that "too loud" matches each activity. Learn more →
Is Noise Meter – Keep Quiet free?
Yes — free to download on iPhone, iPad and Mac, with no ads. Optional premium upgrades unlock extras like additional characters and themes. Get it on the App Store →
Does the app record audio? Is it safe for kids?
The microphone is used only to measure the volume level in real time so the meter and characters can react. The app is ad-free and rated 4+ on the App Store. Read the privacy policy →
Is Noise Meter – Keep Quiet the same app as Too Noisy?
No. Noise Meter – Keep Quiet is made by Natalia Jakubczyk-Gajewska, has App Store ID 6744021866 and its website is keepquiet.app. Some storefronts showed the title "Too Noisy - Keep Quiet" until September 2026; since version 1.0.12 every storefront uses the Noise Meter name. Too Noisy is a different app from another developer. See the app at a glance →
The app
Also on iPhone, iPad & Mac
Noise Meter – Keep Quiet is the same noise meter as an installed app: more characters and scenes, a quiet-time timer, and it works offline.
Free download on theApp Store
★ 4.8 rating · No ads · Ages 4+ · iPhone, iPad & Mac · 11 languages
Noise Meter – Keep Quiet (keepquiet.app) at a glance
Best for: classrooms up to upper primary, families with children from about 3 to 12, and sensory spaces of any age, where a reacting character on an iPad, iPhone or Mac gets kids to lower their own volume.
- Platform
- The app runs on iPhone, iPad and Mac; there is no Android version. The free online noise meter at keepquiet.app works in any current browser, including on Chromebook and Windows.
- Price
- Noise Meter – Keep Quiet is free to download, with no ads. Optional premium characters and themes are available via in-app purchase (plans and prices are shown in the app).
- Parent controls
- Noise Meter – Keep Quiet has no parental gate; purchases go through Apple's standard purchase confirmation.
- Works offline
- Yes. Noise Meter – Keep Quiet needs only the device microphone, not an internet connection.
- Privacy
- Noise Meter – Keep Quiet uses the microphone to measure the sound level in real time; no audio is recorded or stored.
- Ages
- Noise Meter – Keep Quiet is for children from about 3 to 12, classrooms up to upper primary, and sensory spaces of any age. App Store age rating 4+. It is rated 4.8 on the App Store.
- Features
- Noise Meter – Keep Quiet has reacting characters (owl, robot and others), a green-to-red noise bar, a speedometer-style dial, a quiet-time timer, background themes, and reduced motion and high contrast support.
- Languages
- Noise Meter – Keep Quiet is available in 11 languages.
How it differs from Too Noisy and Bouncy Balls
- Keep Quiet offers both: a free browser noise meter at keepquiet.app (like Too Noisy and Bouncy Balls) and an installed app on iPhone, iPad and Mac that works offline.
- Reacting characters plus a quiet-time timer turn staying quiet into a goal kids can win.
- No ads, and no audio is recorded.
For group work, tests and indoor recess, see our classroom noise monitor guide.
Real-time noise meter
Reacting characters
Colour noise bar
Speedometer dial
Quiet-time timer
Background themes
No ads
11 languages
Accessibility: reduced motion & high contrast
Guides
Guides for teachers, parents & carers
Practical, real-world ways to use a visual noise meter — in class, at home, and in sensory-friendly spaces.
Teachers
Classroom noise monitor: a visual way to keep your class quiet
How teachers use an on-screen noise monitor to manage volume during group work, tests and indoor recess.
Read the guide → TeachersHow to keep kids quiet in class without yelling
Save your voice: swap constant shushing for a visual cue students respond to on their own.
Read the guide → TeachersSound level meter for the classroom: how loud is too loud?
What noise levels mean for learning, and how to calibrate the right level for each activity.
Read the guide → Teachers & parentsTeaching voice levels: helping kids find their inside voice
Voice levels 0–4 explained, plus how a live meter makes "inside voices" concrete for kids.
Read the guide → ParentsNoise meter for kids: teach volume awareness at home
Dinner tables, car rides, homework time — how a character kids love turns "be quiet" into a game.
Read the guide → ParentsQuiet time timer: set quiet goals kids can actually hit
Combine a countdown with a live noise meter so kids can see themselves winning quiet time.
Read the guide → ParentsThe quiet game: 7 fun ways to play it (and actually enjoy it)
Fresh twists on the classic quiet game — with a noise meter as the impartial referee.
Read the guide → Sensory & SENDNoise meters for autistic children & sensory-friendly spaces
Using gentle visual feedback to make noise predictable and rooms calmer for sensitive kids.
Read the guide →