Decibel Meter: dB Sound

Decibel Meter Free is a fast, beautiful, and accurate sound level meter for iPhone and iPad. Turn the microphone you already carry into a real-time noise meter with a vivid color gauge, live decibel readout, and an easy-to-read 60-second history chart.

Measure noise anywhere — coffee shops, offices, classrooms, gyms, concerts, traffic, your kid's bedroom — and find out exactly how loud your environment really is. Whether you're protecting your hearing, settling a noise dispute with a neighbor, calibrating a home studio, or just curious how loud life can get, Decibel Meter Free gives you instant, professional-feeling readings without the clutter.

KEY FEATURES • Real-time dB SPL readout with smooth 10 Hz refresh • Color-coded gauge (green / yellow / orange / red) showing safe vs. risky levels at a glance • Live 60-second line chart so you can spot spikes the moment they happen • Min, Average, and Max stats for every session • Smart scene labels: Quiet Library, Normal Talk, Heavy Traffic, Hearing Damage Risk, and more • Save and revisit past measurements — every session is auto-recorded with full chart, stats, and dB band distribution • Rename, share, or delete sessions with one tap • Hearing safety guide based on OSHA / NIOSH exposure thresholds (85 dB 8h, 100 dB 15min, etc.) • Decibel Reference levels: see what 30, 70, 95, 110 dB really sound like in everyday life • Calibration slider (-10 to +10 dB) so you can match a known reference • Home Screen and Lock Screen widgets show your latest measurement at a glance • Beautifully designed, light theme, optimized for iPhone and iPad • Works fully offline — no audio leaves your device

UNLOCK PRO Upgrade to Pro to remove all ads, unlock unlimited history, export sessions as CSV, switch between A / C / Z frequency weighting, and set custom dB threshold alerts that vibrate when noise gets too loud.

NOTE: Like every microphone-based decibel app, results depend on your device's mic and conditions. Decibel Meter Free is not a certified sound level meter and should not be used for legal, medical, or occupational compliance.

No accounts. No audio recording. No data leaves your phone. Just point and measure.

Download Decibel Meter Free and start hearing the world in numbers.