Sound Meter: dB & Spectrum

Sonomètre turns your phone into a pocket noise analyser. It shows how loud it is right now, which frequencies the noise is made of, and keeps a record of every measurement that you can hand to someone as a PDF report or a CSV file. Measure • Live level in dB(A), dB(C) or dB(Z), with Fast, Slow or Impulse time weighting • Min, Leq (the true average), Max and C-weighted peak, with a reset • An LED bar, a reference scale from whisper to jet engine, and the last minute as a graph • Calibration: an offset per microphone, a guided comparison with a reference meter or a 94 dB calibrator, and microphone correction files • Works with the built-in microphone, a headset or a USB measurement microphone Listen by frequency • Watch bass, voice, treble or mains hum, each as its own channel • Pick octave or third-octave bands, a band of your own, or a single frequency • A dashboard of charts, as many as you like, each on its own frequency, with threshold lines • Spectrum analyser with peak hold and average, octave bars, and a spectrogram • The dominant frequency with its musical note, to track down a hum Keep a record • Sessions with start delay and auto-stop, markers and threshold alerts • Save with a name, notes, tags and a place, typed in or found by GPS • History with search, filters and sorting • Per session: Leq, L10, L50, L90, SEL, time above a threshold, a level histogram, the average spectrum and every event • Optional noise dose (NIOSH or OSHA), labelled indicative Share it • A clear PDF report with summary, charts, events, place and measurement settings • CSV with the separator, decimal mark, time format and resolution you choose, with a preview • Save to any folder or share to any app Private by design • Audio is processed in memory and never recorded, stored or sent • Sessions stay on your phone; nothing is uploaded • Location is read only when you tap "Use my location" • No account, works offline Made to read well • Dark or light theme and six accent colours • 10 languages: English, 中文, हिन्दी, Español, Français, العربية, বাংলা, Português, Русский, اردو • Two-pane layouts on tablets and in landscape Readings from a phone microphone are approximate. Sonomètre is not a certified sound level meter (IEC 61672) and should not be used where a certified instrument is required.

First release. • Live sound level in dB(A), dB(C) or dB(Z), with min, Leq and max • Frequency bands and single frequencies as their own charts • Spectrum analyser and spectrogram • Saved sessions with notes and places, PDF report and CSV export • 10 languages, dark or light theme