Decibel Meter: Sound Level dB

v2.0 is here. New spectrum analyser. New noise dosimeter. Calibrated dBA you can trust at a gig, a building site, or in your studio. Privacy first. Nothing recorded.

Real-time decibel readings for real ears. Decibel Meter turns your iPhone into a calibrated dBA sound level meter that audio engineers, musicians, site workers, and parents worried about their kids' hearing can actually trust.

Open the app. The animated gauge moves with the room. Green for quiet. Yellow when you reach conversation. Red when sound levels start damaging hearing. You see the number, the colour, and the trend at the same time.

This is a v2.0 rebuild. Every screen redrawn. New spectrum analyser. New noise dosimeter. Full calibration workflow. Built for people who know what dBA means and built so people who do not will still get a useful answer in three seconds.

CORE MEASUREMENT Live dBA readout updates 30 times per second Colour-coded zones for hearing safety (Green under 70, Yellow 70 to 85, Red above 85) Min, average, maximum, and Leq running stats Peak hold for transient events like clap tests Calibration offset so your iPhone matches a reference SPL meter A, C, and Z weighting curves for professional use

SPECTRUM ANALYSER Real-time FFT spectrum view 1/1 and 1/3 octave bands Frequency cursor with exact Hz readout Magnitude in dB SPL

NOISE DOSIMETER NIOSH and OSHA exposure calculations Cumulative dose timer Threshold alerts when you cross safe exposure Daily exposure summary

EXPORTS Save sessions as CSV or share as image Time-stamped measurement logs Notes field for context (which room, which source, which mic position)

REFERENCES Built-in noise reference guide from whisper at 30 dB to jet engine at 140 dB NIOSH hearing-loss exposure chart OSHA permissible exposure limits

WHO THIS IS FOR Audio engineers checking room tone, monitor levels, and mix decisions Musicians and producers calibrating studio listening volume Live sound engineers verifying FOH and stage levels at gigs and rehearsals Construction, manufacturing, and trade workers monitoring workplace noise Parents, teachers, and event organisers protecting hearing in shared spaces DIY enthusiasts comparing appliances, boilers, vehicles, and quiet test environments

CALIBRATION YOU CAN TRUST The iPhone microphone is excellent. It is not laboratory grade. We give you a one-tap calibration workflow so you can offset your readings against a known reference. Without calibration we still produce useful relative numbers. With calibration you produce numbers you can stand behind in a noise complaint, an exposure log, or a mix session.

PRIVACY FIRST Audio is analysed on device in real time. Nothing is recorded. Nothing leaves your iPhone. The microphone stops the moment you close the screen.

NO ACCOUNT, NO TRACKING You never sign in. We never ask for an email. We never see your sound.

PROFESSIONAL ACCURACY NOTE This app is a tool for monitoring and education. For HSE enforcement, occupational noise compliance, or medical hearing assessment, use a Type 1 or Type 2 certified sound level meter operated by a qualified professional.

Open the app. See the number. Know what it means.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/