Noise Level Monitor: dB Meter

Get to know the sounds around you.

Noise Level Monitor uses your phone microphone to estimate environmental sound levels in decibels. Check a room, follow changes over time, and keep a simple journal of the places you spend your day.

A CLEAR VIEW OF EVERYDAY SOUND
See a large estimated dB reading, a scrolling sound graph, and your session's minimum, maximum and average. Pause and resume when you need to, then save the measurements for later.

MADE FOR YOUR SPACES
Label sessions as Home, Office, Workshop, Outdoors or Other. Explore how your surroundings change throughout the day, from a quiet workspace to a busy shared room.

CORE TOOLS
- Live estimated, unweighted noise readings
- A graph showing sound levels over time
- Session minimum, maximum and energy average
- Start, pause, resume and reset controls
- Saved sessions and local history
- A calibration offset for comparison with a reference meter
- An optional screen-awake setting while listening
- Clearly labelled demo mode to explore the interface

OPTIONAL 24-HOUR PRO PASS
Complete an optional rewarded ad to unlock Pro tools for 24 hours:
- Export saved measurements as CSV text
- Compare the averages of two saved environments
- Set a custom threshold with an on-screen alert and mobile vibration
- No interstitial ads while the pass is active

Threshold reminders work while the app is open and monitoring. Rewarded ads depend on ad and network availability. The free version may show occasional interstitial ads after eligible saved sessions, never during an active measurement. Monitoring, calibration and basic session saving remain available without watching a rewarded ad.

AUDIO STAYS ON YOUR DEVICE
Sound samples are processed in a short-lived memory buffer. The app does not save audio recordings or upload microphone audio. Saved sessions contain level measurements and labels. Google AdMob may process device identifiers and advertising data according to your privacy choices. Available ad privacy controls are in Settings.

UNDERSTAND THE ESTIMATE
Readings are uncalibrated by default. Results vary with microphone hardware, phone audio processing, placement and calibration. Compare with a calibrated reference meter when adjusting the offset. Readings are unweighted, not dBA.

Noise Level Monitor is for general awareness. It is not a certified sound level meter and should not be used to determine workplace compliance or hearing safety.

A little awareness. A quieter day.