Sound Meter: Sound Level Meter

CodingMSTR

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About this app

Sound Meter is a responsive, high-precision decibel meter and acoustic intelligence tool designed for monitoring environmental noise, workplace acoustics, and sound exposure.

Engineered with low-latency PCM audio sampling and double-precision RMS algorithms, Sound Meter delivers real-time decibel (dB SPL) tracking with live timeline waveforms, acoustic metrics, and reference noise exposure guidelines.

KEY FEATURES

• Real-Time Decibel Meter: Fast-response radial gauge tracking sound pressure level (0 to 140 dB SPL) with animated level categorization from Very Quiet to Danger.
• Live Scrolling Timeline: High-resolution sound waveform visualization with selectable 30-second, 1-minute, and 5-minute observation windows.
• Comprehensive Acoustic Metrics:
- MIN: Lowest recorded sound level
- AVG: Time-weighted arithmetic average decibels
- MAX: Peak transient noise capture
- LEQ: Energy-domain Equivalent Continuous Sound Level for true acoustic exposure evaluation
• Microphone Calibration Tool: Fine-tune calibration offsets (+/- 0.1 dB and +/- 1.0 dB increments) against reference sound level meters.
• Session Recording & Notes: Save sessions with custom titles and detailed field notes directly to on-device storage.
• Multi-Session Comparison: Select and compare up to 4 measurement sessions simultaneously with overlay graphs and comparative analytics.
• CSV Data Export: Export full-resolution measurement logs, timestamps, and statistical metrics to CSV for analysis in spreadsheet tools.
• Focus Mode: Minimalist, high-contrast, distraction-free display optimized for distance visibility during field tests.
• NIOSH Noise Guidance: In-app permissible noise exposure limits (85 dB for 8h down to 100 dB for 15min) to support hearing conservation awareness.
• Display & Theme Control: Keep screen awake during extended recordings, with adaptive Dark Mode and Light Mode support.

100% ON-DEVICE PRIVACY GUARANTEE

Your privacy is our highest priority:
• No Audio Recording: Audio waveforms are processed in volatile memory (RAM) solely to compute decibel amplitudes. Audio is never recorded, transcribed, or stored on disk.
• No Cloud Uploads: Raw microphone audio never leaves your device.
• Total Local Control: All saved session records remain strictly on your phone. You can clear your measurement database at any time in Settings.

DISCLAIMER & INTENDED USE

Sound Meter is intended for educational, reference, and informational noise monitoring purposes. Smartphone internal microphones vary by hardware manufacturer and are not certified occupational dosimeters. For official regulatory, industrial hygiene, or legal noise compliance certifications, use calibrated ANSI/IEC Type 1 or Type 2 sound level meters.