# SonoSpec: Audio Spectrum RTA — Live FFT, Waterfall & Octaves

> Live FFT, Waterfall & Octaves (iPhone/iPad app by Corey Thomas Slick.)

- Source: https://appshunter.io/ios/app/sonospec-audio-spectrum-rta/id6804465268 (this page in markdown: same URL + `.md`)
- Developer: [Corey Thomas Slick](https://appshunter.io/developer/1818871667)
- Category: Music, Utilities
- Price: $9.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-09-07
- Data updated: 2026-09-22
- User reviews in markdown: https://appshunter.io/ios/app/sonospec-audio-spectrum-rta/id6804465268/reviews.md

## What is SonoSpec?

SonoSpec turns your phone's microphone into a beautiful real-time audio spectrum analyzer. Built for car-audio tuning, room acoustics, HVAC and machinery noise hunting, speaker testing, and anyone who wants to SEE what they're hearing.

FOUR VIEWS, ONE INSTRUMENT
• Spectrum — live FFT trace with peak hold and a log-frequency grid
• Waterfall — scrolling spectrogram that makes tones, sweeps and rattles obvious
• Split — spectrum and waterfall together
• Octave — 31-band 1/3-octave RTA bars

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
• Exact base-10 1/3-octave bands per the IEC 61260 definitions
• Peak-hold trace with slow decay, pause/hold, and a drag cursor that reads out the exact frequency and level under your finger
• Levels in dBFS with a proper full-scale sine reference and window-bandwidth (ENBW) correction — the numbers mean something

BUILT-IN SIGNAL GENERATOR
• Pink noise, white noise, sine, log sweep and warble tones — the source half of the RTA workflow
• Feed the system under test by cable or USB and watch the response live

TARGET CURVES
• Overlay a house curve — flat, −3 dB/oct tilt, or a bass-lifted car target — on the live spectrum
• Auto-fit positioning: the shape snaps to your measurement, no fiddling

SNAPSHOTS & EXPORT
• Freeze a measurement and recall it as a ghost overlay for before/after comparison
• Share a publication-ready image or CSV with a full metadata header — FFT size, window, weighting — so your data still means something later

TUNED TO FEEL LIKE HARDWARE
Rendering runs on a dedicated Metal graphics path at the full analysis rate, with a phosphor-and-ember instrument look that's readable at arm's length.

PRIVATE BY CONSTRUCTION
Audio is analyzed on-device and never recorded, stored, or transmitted. SonoSpec has no accounts, no ads, no analytics — the app cannot even access the network.

One-time purchase. No subscriptions.


## Version history (last 1 release)

### 1.0 — 2026-09-08

No release notes.

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## More apps by Corey Thomas Slick

- [Research Radar: Auto Briefings](https://appshunter.io/ios/app/research-radar-auto-briefings/id6746874818)
- [Thermlapse – Thermal Timelapse](https://appshunter.io/ios/app/thermlapse-thermal-timelapse/id6756284960)
- [FlickerSpec: LED Flicker Test](https://appshunter.io/ios/app/flickerspec-led-flicker-test/id6759629660)
- [CarSense: AI Car Diagnostics](https://appshunter.io/ios/app/carsense-ai-car-diagnostics/id6760952816)

All apps by Corey Thomas Slick: https://appshunter.io/developer/1818871667

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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 2026-09-22.*