Real-time decibel readings
The dial responds as the room changes, with a colour that shifts from green through amber to red as levels climb.
Free · Android 8.0+
Measure noise in decibels.
Turn your phone into a sound level meter. See how loud a room really is, watch the level move on a live graph, and compare any reading against everyday sounds — from a whisper to a jet engine.
No account. No setup. Audio never leaves your phone.
42dB
40dB : Quiet Library
Calibrate
—MIN
—AVG
—MAX
Start
Stop
Reset
A simulation of the app running — this page never uses your microphone.
Everything a sound meter should do
Built to answer one question quickly: how loud is it here, right now?
Live sound graph
A rolling 15-second plot of the noise level, so you can see spikes you would otherwise miss.
Min, average and max
Every session tracks its quietest point, its loudest, and the average across the whole measurement.
Reference chart
Compare any reading to fourteen familiar sounds, so a number on screen actually means something.
Adjustable calibration
Phone microphones vary by more than 10 dB between models. Trim the reading to match a meter you trust, once, and it is remembered.
Private by design
Audio is analysed on your device and discarded immediately. Nothing is recorded, saved or uploaded.
How loud is too loud?
Decibels are logarithmic, so every 10 dB is roughly a doubling of perceived loudness. Prolonged exposure above about 85 dB is generally considered a hearing risk. This is the reference chart built into the app.
| Level | Sound | What it feels like |
|---|
How the measurement works
The app reads raw audio from the microphone and calculates the RMS level of each block of samples. That is normalised against digital full scale to give a value in dBFS, then shifted onto the sound pressure scale using a calibration offset. The audio itself is thrown away the moment the number is produced — it is never buffered to a file.
That calibration offset is the honest part of any phone sound meter. A handset microphone is not a laboratory instrument: it has its own frequency response, automatic gain behaviour and physical placement. The app ships with a sensible default and lets you trim it, which is why readings can be brought in line with a real sound level meter rather than being permanently a few decibels out.
Questions
Does the app record what I say?
No. Audio is analysed in real time to produce a loudness number and then discarded. Nothing is written to storage and nothing is transmitted. There is no speech recognition of any kind.
How accurate is a phone as a sound meter?
Close, but not certified. Phone microphones vary between models and are not calibrated instruments, so treat readings as a good approximation. With the calibration setting adjusted against a known reference, most phones land within a few decibels. It is not a substitute for a professional meter where a legal or occupational measurement is required.
What is a safe noise level?
As a general guide, sustained exposure above roughly 85 dB carries a hearing risk, and the safe exposure time falls sharply as levels rise beyond that. Brief peaks matter less than long exposure. For anything health related, consult the guidance from your national health or occupational safety body.
Does it work without an internet connection?
Yes. Measuring is entirely local and works offline. A connection is only used to load ads.
Why does it need microphone permission?
Measuring sound requires reading the microphone — that is the whole function. You can revoke the permission at any time in Android settings; the app will simply stop measuring.