dB Meter — Sound level analyzer and meter for Wear OS.

Measure the sound around you directly from your wrist!
In real time, with technical accuracy based on IEC 61672, OSHA, and NIOSH standards.

📊 REAL-TIME MEASUREMENT
• Analog meter with instant sound level reading.
• Minimum, average, and maximum values are always visible.
• Continuous 30-second history graph with floating peak marker.

🔊 FREQUENCY WEIGHTING
• dBZ — unweighted, flat response.
• dBA — weighting for human hearing, OSHA/NIOSH standard.
• dBC — weighting for frequency extremes and impact sounds.
• Change the weighting in real time without interrupting the measurement.

📈 SPECTRUM ANALYSIS
• Real-time octave band spectrum display.
• Identify the dominant frequencies in your environment.

⚙️ CALIBRATION
• Microphone level calibration.
• Microphone frequency response curve calibration.
• Technical reference based on IEC 61672.
• The dB Meter app is not a factory-calibrated measuring instrument.
• For reliable measurements, calibrate the app with a calibrated sound level meter.

🔋 OPTIMIZED FOR SMARTWATCH
• Interface designed for Wear OS round screens.
• Low battery consumption.
• Fully autonomous — no paired smartphone required.
• Watch Face complication — displays the current sound level directly on the watch face.

--- USE CASES —
• Audio enthusiasts, musicians, sound engineers, and occupational health professionals.
• Acoustics education and demonstrations.
• Assessing noise levels in work environments.
• Verify compliance with occupational exposure limits (OSHA/NIOSH).
• Monitor noise in gyms, concerts, restaurants, and urban environments.

--- COMPATIBILITY ---
• Compatible with Wear OS 4 or higher.
• Tested on Galaxy Watch 7 and Pixel Watch.

--- PRIVACY AND SECURITY ---
✅ The dB Meter uses the smartwatch's microphone exclusively to calculate the sound pressure level in real time.
✅ The internet connection is used exclusively to verify the app's authenticity via the Google Play Integrity API. No user data, telemetry, audio, or personal information is transmitted.
✅ All audio processing is done LOCALLY on the device.
✅ No audio is recorded, stored, or transmitted.
✅ No audio data is sent to external servers, third parties, or the internet.
✅ The microphone is only accessed while the measurement is active on the screen.
✅ The app does not require a user account, login, or internet connection.
✅ The RECORD_AUDIO permission is used solely to read the sound pressure level (SPL).
✅ The audio signal is processed in RAM in real time and discarded immediately after calculation - it is never saved.