# ListenAid > see what you hear Canonical page: [https://chrome-stats.com/d/id6747974662](https://chrome-stats.com/d/id6747974662) ## Overview - **ID:** `id6747974662` - **Platform:** Apple - **Type:** Apple app - **Status:** Available - **Publisher:** Michael Reisigl - **Category:** Music - **Version:** 34 - **Last updated:** 2026-08-10 - **First published:** 2025-06-30 - **Size:** 4.86 MB - **Data as of:** 2026-09-19 - **Store listing:** [Apple App Store](https://apps.apple.com/us/app/listenaid/id6747974662) - **Website:** [http://www.terabel.at](http://www.terabel.at/) - **Privacy policy:** [https://www.freeprivacypolicy.com/live/1985cfff-6ce8-4cd5-8a9f-bcaf4a7c4034](https://www.freeprivacypolicy.com/live/1985cfff-6ce8-4cd5-8a9f-bcaf4a7c4034) ## Description ListenAid - intuitive & clean realtime audio spectrum analysis. ListenAid is an acoustic visualization tool optimized for live sound engineering and system tuning (leveraging transfer functions and multi-resolution processing), delivering maximum performance through Metal and Accelerate hardware acceleration. Audio Engine & Core DSP • Lock-Free Processing (RingBuffer): non-blocking, zero-dropout audio. • Low-Level Math (vDSP): minimal CPU load • Real-Time Transfer Function: Live reference vs. live channel division: instantly shows frequency responses differences 5 different Analysis models: • STFT: Standard Short-Time Fourier Transform. • CWT: Continuous Wavelet Transform for high-frequency time resolution; optimized via integral images. • CQT: Constant-Q Transform with variable smoothing. • QTAM: Amplitude demodulation in the frequency domain. • Multi-Resolution: Concurrent Low, Mid, and High FFT windows for low-end frequency and high-end time resolution. Metal GPU Rendering • Spectrogram is GPU-offloaded; maintains 60 FPS even at massive bin sizes • Phase Reassignment: Analyzes frame phase differences, shifts energy to exact sub-bin frequencies to sharpen visual traces • Simultaneous FFT Traces: Concurrently plots Live, Reference, and Secondary traces with customizable colors and opacities • Dynamic Viewport (ViewportMath): Continuous pan and zoom Analytical Tools & Precision • Sub-Bin Peak Detection: Calculates precise peak frequencies using FFT phase correction or logarithmic-parabolic interpolation • Pitch Conversion (FrequencyConverter): translates frequency peaks to notes, showing cent deviations (with adjustable concert pitch) • Weighting & Tilt: A- and C-Weighting filters; adjustable display tilt • Smoothing & Averaging: Exponential, RMS, LUFS, Leq or Peak Hold averaging; psychoacoustic fractional octave smoothing (1/96 to 1 full octave). System Tests & Signal Generation • Sine Generator: Artifact-free oscillator with amplitude fade envelopes; outputs up to the Nyquist frequency • Channel Control (SystemTestManager): Routes the generator or loop player via Normal, Solo L/R, or Phase Invert • Loop Playback: Imports and loops custom audio files to test spaces using known reference tracks Workflow & Connectivity • Multipeer Control (MultipeerManager): fully remote-control another instance at the mixing desk (volume, mute, generator, playback) • Smart Routing: AudioEngine safely intercepts hardware changes and manages BT profiles • Preset System: Instantly save and recall all DSP and UI configurations via slots A, B, and Y. ## Rankings - #1,440,283 — Overall ## Similar extensions and apps - [Audiolyze](https://chrome-stats.com/d/id6775101212) — 5.00 / 5 - [Spectrum Analyzer+ FFT](https://chrome-stats.com/d/id6760830858) — 2.30 / 5 - [SoundScope: Audio Analyzer](https://chrome-stats.com/d/id6758302945) - [Spectrum-V: Audio analyzer](https://chrome-stats.com/d/id6450556284) - [Audio Spectrum Pro: Analyzer](https://chrome-stats.com/d/id6780856025) - [FFT Analyzer](https://chrome-stats.com/d/id6760554712) - [MintFFT](https://chrome-stats.com/d/id6755054786) — 4.70 / 5 - [Audio Spectrum Analyzer Pro](https://chrome-stats.com/d/id1152352806) — 4.40 / 5 - [Frequency Analyzer Spectrum](https://chrome-stats.com/d/id6476630221) — 4.40 / 5 - [SoundCheck RTA](https://chrome-stats.com/d/id6788231499) — 5.00 / 5 - [Prism Audio - Sound Analyzer](https://chrome-stats.com/d/id6780786251) - [Audio RTA](https://chrome-stats.com/d/id861969994) — 4.40 / 5 --- Source: [Chrome-Stats](https://chrome-stats.com/d/id6747974662)