Honest sound measurement, on your iPhone.

Precise SPL, real-time analyser, FFT, spectrogram, and RT60 — all running locally on your device. No account, no tracking, no cloud.

Download on the App Store Coming soon

What it measures

SPL meter

A/C/Z weighting, Fast/Slow/Impulse time-weighting, Leq, L10, L90, Lmax, Lmin, Lpeak, with one-tap session reset.

Real-time analyser

1/1 to 1/24 octave bands with peak-hold. Fractional bands unlock with Pro.

FFT

Hann / Hamming / Blackman / Blackman-Harris windows, sizes up to 65,536, exponential averaging. Scroll-lock with Freeze.

Spectrogram (Pro)

Live + rolling waterfall view. Pro unlocks the spectrogram across the audible band.

RT60 decay

Pink-noise excitation, eight standard octave bands, route-aware so built-in speaker results stay honest.

Signal generator

Sine, pink, white, and swept sine — for calibration, room testing, or ear training.

Recording & export

WAV capture with synchronised spectrogram sidecar. Export PNG, CSV, or PDF reports.

Accuracy you can trust

SoundMess Lab ships with per-device microphone compensation curves for recent iPhones and iPads, and lets you fine-tune with a reference tone from any known source. For professional work, import your own calibration file (.txt / .frd) from an external measurement mic.

Pricing

FreeForever, no ads, no account
$0
Pro — Lifetimeone-time purchase, Family Sharing
$15.99

Free includes SPL meter (with L10/L90 + session reset), 1/3-octave RTA, FFT (Hann · 4096 · no averaging), and per-device microphone compensation.
Pro unlocks the spectrogram view, RT60 room measurement, fractional RTA (1/6, 1/12, 1/24), advanced FFT (sizes up to 65,536, multiple windows, averaging), signal generator, recording & playback, PNG / CSV / PDF export, reference-tone calibration, and external mic calibration-curve import.
One-time purchase. No subscription, no auto-renew. Family Sharing supported.

Privacy by design

Nothing you measure ever leaves your device. SoundMess Lab has no server, no analytics, no ads, no account. Audio is only written to disk when you explicitly start a recording — and those files stay in your app sandbox until you choose to share them.