Decibel

Decibel is a sound level meter. It opens measuring: no start button, no settings to visit first. • The level in dB, with the word that goes with it: Calm, Busy, Loud, Harmful over time • Minimum, maximum, average and peak since you last started again • The last minute drawn under the number, with the 85 dB line always visible: a room is judged by its noise over a while, not at an instant • Fast and Slow, the two time weightings of real meters (125 ms and 1 s) • The average is the energy average (Leq), not the average of the decibels: a slammed door cannot be cancelled out by averaging it with silence • Above 85 dB the phone buzzes and the screen turns red — that is the level where prolonged exposure damages hearing One thing said plainly: **it is an estimate**. A phone microphone is not a calibrated instrument, and no app can make it one. If you have a real meter you can compare and move the calibration: from then on the scale is yours. What Decibel does not do: • no account, no sign-up • **it does not record**: the sound is analysed in the phone's memory and thrown away, and no file is ever written • no location, no servers of ours Permissions: microphone (to hear the room), Internet (ads only) and vibration. The app is free and paid for by ads: a banner at the bottom, away from the controls, and an occasional full-screen ad only after a finished measurement. Privacy policy: https://mindcontact.app/mcma-decibel/privacy/