DeciBell: Sound Level Meter

DeciBell is a live sound level meter for quick checks of the noise around you.

Open the app and the meter starts with a large estimated dB reading, a color-coded analog gauge, and a plain category such as Quiet, Moderate, Loud, Very Loud, or Harmful. It helps you compare room noise, appliances, traffic, events, workshops, gyms, classrooms, offices, and other spaces where you want a quick picture of surrounding loudness.

What you can see in DeciBell:
- Live decibel estimate from the phone microphone
- Color-coded gauge from quiet to harmful levels
- Noise category with real-world examples
- 85 dBA exposure reference guide with an approximate exposure-time estimate
- Session min, max, and average readings
- 60-second graph showing recent sound changes
- Start, pause, reset, and share-reading controls
- Calibration offset for matching a trusted reference meter
- Settings and accuracy notes inside the app

Audio and privacy:
DeciBell uses the microphone only to calculate loudness while the meter is running. Audio is processed in memory on the device. The app does not record audio, save audio files, upload audio, use an account, or require an internet connection.

Accuracy note:
DeciBell is an estimate of phone hardware. Readings can vary by device, case, distance, microphone limits, and automatic gain control. It is not a certified sound-level meter, medical device, hearing-protection device, or workplace compliance instrument.