How It Works
This page uses your device microphone and standard browser audio APIs to read the incoming signal in real time. The signal level is converted into an estimated decibel value, then lightly smoothed so the number stays readable instead of jittering wildly. The goal is not lab accuracy. The goal is a fast, useful reference point when you want to compare one room, one desk setup or one everyday sound against another.
Because the whole process runs in the browser, it starts only after a tap or click. If access is denied, the page stays intact and explains what happened instead of leaving a broken widget behind.
How Accurate Is It?
Accuracy depends heavily on the microphone built into your phone, laptop or tablet. Different devices boost voices differently, suppress background noise differently and react differently to distance from the sound source. That means two devices in the same room may not show the exact same value. Treat the number as a practical estimate for everyday use, not as a replacement for a calibrated SPL meter.
If you want more reliable comparisons, keep the device position consistent, measure from the same distance and avoid touching or covering the microphone during the session.