Loudly: Decibel Meter dB

Measure noise, protect your hearing, document what matters. IEC 61672 compliant. 100% on-device — no ads, no tracking. Pay once for Pro, yours forever.

Turn your iPhone into a professional-grade sound level meter. Loudly measures noise levels in real time with stunning accuracy, displayed on a beautiful Liquid Glass gauge.

Whether you're checking if your baby's room is quiet enough, documenting noise for a complaint, or protecting your hearing at a concert — Loudly gives you instant, reliable decibel readings.

ACCURATE & PROFESSIONAL • IEC 61672 compliant audio engine • A-weighting and C-weighting frequency filters • Fast, Slow, and Impulse time weighting modes • Calibration controls for reference-level accuracy

BEAUTIFUL & INTUITIVE • Large, easy-to-read circular gauge • Color-coded noise levels: green (safe) → red (dangerous) • Noise categories with real-world examples: Whisper, Quiet, Moderate, Loud, Very Loud, Dangerous

PRO FEATURES (one-time $2.99 unlock) • Min / Max / Average statistics • Session history — track measurements over time • Peak alerts — get notified when noise exceeds your threshold • Leq (equivalent continuous sound level) calculation • Export your readings

PRIVACY FIRST • No data collection. No ads. No tracking. • 100% on-device processing — audio is never recorded or stored • No network requests. Your microphone data stays on your device.

COMMON USES • Check noise levels at work, home, or events • Monitor baby room sound levels • Document noise for complaints or disputes • Measure environmental noise pollution • Protect your hearing — know when it's too loud

No subscription. No ads. Pay once for Pro, yours forever.