Sound Noise Meter+ dB SPL

Sound Noise Meter+ is a professional-grade sound level meter with built-in OSHA/NIOSH 8-hour noise dose tracking, A/C/Z weighting, and one-tap Quiet Room calibration. No hardware required — just your iPhone. The radial gauge displays live dB SPL from 0 to 120, color-coded green / yellow / red so you can read your environment at a glance. Switch to the Dose Panel to watch your 8-hour TWA build in real time, with separate OSHA (90 dBA / 5 dB exchange) and NIOSH (85 dBA / 3 dB exchange) accumulators. Key Features: • Real-time decibel measurement (0–120 dB SPL) • OSHA + NIOSH 8-hour noise dose tracking with TWA • A / C / Z weighting toggle (dBA · dBC · dBZ) • Quiet Room one-tap calibration (3-second auto-cal) • Animated radial gauge with color-coded noise levels • Live waveform chart with continuous monitoring • Min, Average, and Max dB tracking per session • Manual calibration adjustment (±20 dB) for precision tuning • 12 noise level descriptions with reference examples • Dark theme interface optimized for any environment Perfect For: • Checking workplace noise levels for OSHA compliance • Monitoring neighborhood and traffic noise • Measuring music venue and concert sound levels • Assessing classroom or office noise environments • Testing speaker and audio equipment output • Environmental noise surveys and studies The app features an intuitive dark interface with a professional radial gauge that animates smoothly as sound levels change. Track minimum, average, and maximum readings to understand noise patterns over time. The built-in calibration tool lets you fine-tune measurements for your specific device. Your privacy matters — all audio processing happens locally on your device. No recordings are stored or transmitted. Sound Noise Meter respects your privacy completely.