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SonoSpec

See what you're hearing.

A beautiful real-time audio spectrum analyzer for iPhone and Android. Live FFT, scrolling waterfall, 1/3-octave RTA, A/C weighting — all processed on your device, nothing ever recorded.

Download on the App Store Get it on Google Play

See it in action

Four views, one instrument

Spectrum

Live FFT trace with peak hold, a log-frequency grid, and a drag cursor that reads out the exact frequency and level under your finger.

Waterfall

A scrolling spectrogram in an ember colormap that makes tones, sweeps, rattles, and intermittent noises impossible to miss.

Split

Spectrum and waterfall together — watch a peak and its history at the same time.

1/3-Octave RTA

31 bands on the exact base-10 midbands per the IEC 61260 definitions, with hot-band highlighting.

Screens

Split view: spectrum and waterfall Waterfall spectrogram 1/3-octave RTA bars

The complete workflow — source, measure, compare, document

Signal generator

Pink noise, white noise, sine, log sweep and warble tones built in — feed the system under test by cable or USB and watch the response live. No second device, no separate tone app.

Target curves

Overlay a house curve — flat, −3 dB/oct tilt, or a bass-lifted car target — as a dashed reference over the live spectrum. Auto-fit positioning snaps the shape to your measurement.

Snapshots & export

Freeze a measurement, recall it as a ghost overlay for before/after comparison, and share a publication-ready image or CSV with a full metadata header.

Measurement-grade details

FFT sizes from 2,048 to 16,384 points — 5.9 Hz resolution at 48 kHz.
A, C and Z weighting curves computed per the IEC 61672 formulas, applied per-bin.
Levels in dBFS against a true full-scale sine reference, with window-bandwidth (ENBW) correction on band and overall sums.
Peak hold with slow decay, pause/hold, adjustable dB floor and frequency range.

Pricing

$9.99
one-time purchase