Sound Noise Meter+ dB SPL

About this app

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.

New: today's total noise exposure, added up across every session — exposure limits are set per day, but the app only ever showed one session at a time. Also: measuring now starts the instant you tap, and the quiet-room reference tells you when the room is too noisy for it to be reliable instead of just saying "calibrated". Thanks for the reviews and feedback!

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 18, 2026 · 2:58 AM Free