# SoundMess Lab: SPL Meter — SPL, RTA, FFT and RT60.

> SPL, RTA, FFT and RT60. (iPhone/iPad app by Chih Han Lin.)

- Source: https://appshunter.io/ios/app/soundmess-lab-spl-meter/id6762592034 (this page in markdown: same URL + `.md`)
- Developer: [Chih Han Lin](https://appshunter.io/developer/1800248325)
- Category: Music, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English
- Released: 2026-04-21
- Data updated: 2026-08-26
- User reviews in markdown: https://appshunter.io/ios/app/soundmess-lab-spl-meter/id6762592034/reviews.md

## What is SoundMess Lab?

SoundMess Lab is a careful, offline sound measurement tool for iPhone and iPad. Built for musicians, producers, podcasters, acoustic enthusiasts, and anyone who wants to understand what they're hearing.


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
• FFT — Hann, Hamming, Blackman, Blackman-Harris windows, sizes up to 65,536, exponential averaging
• Spectrogram — five tuned colour palettes, live and rolling (Pro)
• RT60 — per-octave-band reverberation time, ISO 3382-2 T20 method with interrupted pink noise (Pro)
• Signal generator — sine, pink, white, swept sine (Pro)
• Reference-tone calibration — trim every reading against a known 94 dB source (Pro)


BUILT CAREFULLY

SoundMess Lab implements the IEC 61672 A/C/Z weighting curves with published coefficients to 10 decimals, Paul Kellett pink noise, and ISO 3382-2 T20 linear regression for RT60 fitting. Every reading shows a confidence indicator so you know which frequencies you can trust — built-in iPhone microphones have known hardware limits below 500 Hz and above 8 kHz, and we don't pretend otherwise.


HONEST ABOUT LIMITS

Every phone microphone has physical constraints. SoundMess Lab shows you where it can be trusted and where it can't. It's a serious listening tool for creative work — not a replacement for a calibrated measurement microphone in professional field acoustics or compliance settings.


PRIVACY BY DESIGN

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


FREE INCLUDES

SPL meter (with L10 / L90 / session reset), 1/3-octave RTA, FFT (4096 · Hann), per-device microphone compensation, five themes.


PRO UNLOCKS

Spectrogram (live + rolling), RT60 room-acoustics measurement, fractional RTA (1/6, 1/12, 1/24), advanced FFT (sizes up to 65,536, Hamming / Blackman / Blackman-Harris windows, exponential averaging), signal generator (sine / pink / white / sweep), recording & playback, WAV / CSV / PDF export, reference-tone calibration, external mic calibration-curve import (.txt / .frd).


PRICING
 • $8.99 one-time Lifetime · Family Sharing supported
One-time purchase. No subscription, no auto-renew.


BUILT FOR THE WORK

Most sound apps optimise for the spike — big colourful needles and "how loud is a rock concert" trivia. SoundMess Lab is built for the work: reading a room, shaping a mix, checking a speaker, measuring a decay, teaching acoustics. Careful DSP, calm UI, no noise.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| SoundMess Lab Pro (Lifetime) | $5.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-08-13

Compare measurements with confidence. Version 1.0.2 adds notes, tags, and baseline marking to recording history, plus overlaid RTA and FFT A/B comparisons with frequency-by-frequency differences.

Audio input is now clearer and more resilient, with microphone details, permission guidance, interruption recovery, and improved route-change handling. We also reclaimed more room for the spectrum display and fixed launch and recording edge cases.

### 1.0.1 — 2026-05-04

Pro Lifetime is now $8.99. Same one-time unlock, same Family Sharing, no subscription tier I'm "considering."

The meter no longer falls over if a call interrupts you or you plug in headphones mid-measurement — the audio session now handles interruptions and route changes the way it should have from day one.

Two small paywall fixes: it'll tell you when Restore actually worked (or didn't), and it gives you a Try Again button when products fail to load instead of just a wall of grey text.

Solo-built. On-device. No accounts, no analytics. If something's off, please write — I read everything.

### 1.0 — 2026-04-21

No release notes.

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| --- | --- | --- | --- |
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## More apps by Chih Han Lin

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- [SpellSynth: Retro Vocal Synth](https://appshunter.io/ios/app/spellsynth-retro-vocal-synth/id6762822700)

All apps by Chih Han Lin: https://appshunter.io/developer/1800248325

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*