v1.6.0

Level meter

Show live microphone RMS and peak level in dBFS, uncalibrated, with fast or slow meter ballistics.

npx web-audio-api level-meter
ballistics=<fast|slow>
meter response speed
gain=<number>
input gain
rate=<hz>
sample rate (default: 44100)
ch=<number>
input channels (default: 1)
bit=<number>
input PCM bit depth (default: 16)
backend=<name>
@audio/mic backend: miniaudio/auto or process
ready

Other examples

02Chromatic tunerEstimate microphone pitch, nearest note, and tuning error in cents.Measure 03Latency testerPlay short clicks through the speakers and time their return through the microphone to measure round-trip latency.Measure 01MetronomeSchedule a click pattern with accents, rests, tempo control, and instrument presets.Create

This is a mic level meter and dB meter you can run online: it shows live RMS and peak levels in dBFS with a choice of fast or slow ballistics, though the reading is uncalibrated and not a substitute for an SPL meter. Use the browser demo to watch input levels while setting gain, or the Node CLI to print a running level meter in the terminal.