Decibel Meter – Noise Dose

Decibel Meter turns your iPhone into a sound level meter — and goes one step further: it tells you when noise starts harming your hearing. MEASURE • Real-time sound level with smooth gauge, Leq, peak and min/avg/max readings • dB(A), dB(C) and dB(Z) frequency weighting with standard Fast/Slow/Impulse response — readings comparable to dedicated SPL meters • Live level curve with a tap-to-enlarge view and the 85 dB NIOSH line • Fullscreen big-display mode — read the level from across the room • Auto-stop timer for fixed-duration measurements (1–60 min) • Reference chart: compare your surroundings to everyday sounds • Works fully offline, instant start ANALYZE (PRO) • Real-time spectrum analyzer: 31 third-octave bands with peak hold • Waterfall spectrogram — see how frequencies change over time • Dominant frequency readout with musical note — see what makes the noise • L10/L50/L90 percentile statistics in every report PROTECT YOUR HEARING • Daily Noise Dose: tracks your exposure against the NIOSH 85 dB / 8h standard • Session TWA, dose and 8-hour projection — switch NIOSH or OSHA in Settings • See how long you can safely stay in your current environment • Home Screen widget keeps your daily dose in sight TRACK • Session history with charts and per-session notes (location, source) • Save finished measurements to Apple Health (optional, write-only) • Share a clean report image with one tap • Start and stop measuring with Siri Shortcuts PRIVATE BY DESIGN • Audio is analyzed in real time on your device — never recorded, never uploaded • No account, no ads, no tracking. Nothing leaves your phone. PRO — PAY ONCE, YOURS FOREVER Upgrade once to unlock the real-time spectrum analyzer and waterfall spectrogram, dB(C)/dB(Z) weightings, PDF & CSV report export, full-history export, a custom alert threshold, a calibration offset, and iCloud history sync. No subscription, no tricks — the price is always shown upfront, and live measuring, noise dose and history stay free forever. Note: readings are for reference and hearing awareness, not a substitute for professional calibrated equipment or medical advice. Privacy policy: https://sparkfallgames.com/decibelmeter/privacy.html