Everything on this site, in one place.
The live sound level meter: real-time decibel gauge, frequency spectrum, 60-second history chart, session stats (average, peak, minimum, exposure time), and a real-world sound comparison table with everyday sound-level guidance.
Record 10 seconds of sound in two different places and see them side by side — which is quieter, by how many decibels, and whether you'd actually hear the difference. Includes a guide to fair comparisons and FAQs.
A free, teacher-friendly noise monitor for the classroom. Project it on your board, set a noise limit, and let students see when the room is getting too loud. Runs fullscreen in any browser, with tips for using it well.
Test your speakers, headphones, or earbuds — play a tone on the left channel, the right channel, and both together to catch a dead speaker, a swapped channel, or a broken headphone side.
Play a pure sine, square, triangle or sawtooth tone at any frequency from 20 Hz to 20 kHz, with a live musical-note readout, one-click presets, left/right channel routing, and a slow sweep across your whole hearing range.
Guides and explainers on sound, noise, and decibels — plain-English reading to go along with the tools.
Send us a question, bug report, or feature idea. The form opens a draft in your own email app — no data passes through a server.
How Noise-Meter handles your microphone and data — in short: everything stays on your device, nothing is recorded or uploaded.
This page — an overview of the whole site.