Noise Monitor

If you're dealing with a noisy neighbor, a construction site, or any other ongoing noise issue, a single reading rarely convinces anyone — noise complaints are usually won or lost on a documented pattern over time. Start a session when the noise begins, let it run, then export it as a CSV with your session duration and Leq/L10/L50/L90 statistics to keep a timestamped record.

Set an alarm threshold at your local noise limit (see "How many dB is allowed?" below, or check your city's ordinance) and the tool will flag it visually — and with sound, if enabled — the moment a reading crosses it.

Leq is the true energy-averaged level over your whole session — the single number most closely tied to actual acoustic energy and hearing-risk exposure. L10, L50 and L90 are percentile statistics built from a running histogram of every reading: L10 is the level exceeded only 10% of the time (effectively, how loud the louder moments get), L50 is the median level (a good read on "typical" background noise), and L90 is the level exceeded 90% of the time — commonly used as a proxy for the underlying, steady background noise floor once intermittent louder events are set aside.

Classroom mode turns the monitor into a full-screen traffic-light display with two configurable thresholds — a visual cue students can self-regulate against without needing to read a number. A built-in quiet timer tracks how long the room has stayed under the lower threshold, and numbers can be hidden entirely for younger classrooms where a color is a clearer signal than a decibel figure.