--- title: "ListenAid - Reviews, Revenue and Downloads in Austria | Apple App Store" 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 m" --- # ListenAid — Austria ![ListenAid App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/ee/d8/ce/eed8ce37-ad65-bda2-cfae-bbde412c6f19/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png) **Developer:** [Michael Reisigl](https://apptail.io/developer/michael-reisigl-TgfHy) (Austria) **Category:** Music **Rating:** 5.0/5 (4 ratings) **Price:** €4.99 **Bundle ID:** com.terabel.teraFFT **Store:** Apple App Store **Country:** Austria **Version:** 34 (released 2026-08-10) **Original Release:** 2025-06-30 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/at/app/app/id6747974662) **AppTail Page:** [https://apptail.io/app/listenaid-dfcw/austria](https://apptail.io/app/listenaid-dfcw/austria) ## ListenAid 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. ## ListenAid Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/31/f2/3d/31f23d11-13ff-82a7-3917-4a0b75b35e8d/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.08.49.png/1260x2736.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/52/dc/24/52dc24cf-1a27-a4a6-1f56-a74a646ab677/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.22.40.png/1260x2736.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/8d/37/da/8d37daf9-be3d-c289-28af-7288443d0130/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.20.09.png/2736x1260.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/eb/1e/a8/eb1ea8d1-117e-2a9f-6fe4-d62717645e29/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.18.35.png/2736x1260.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/43/2f/9a/432f9ab7-1aff-48e0-2955-1518d3313243/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.15.38.png/2736x1260.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/9e/06/7d/9e067dd4-7ae9-1bb2-609d-0b46356c72f9/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.21.45.png/2736x1260.png) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2c/7f/fe/2c7ffe2a-0763-1829-3fca-573523a4e026/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.23.10.png/1260x2736.png) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/04/fd/d5/04fdd5a2-da57-48f4-2bc3-63a92bfa3930/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.22.49.png/1260x2736.png) - [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/5a/60/1f/5a601f8a-57bc-9924-5288-9c66015de640/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.23.00.png/1260x2736.png) - [Screenshot 10](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/31/70/72/317072d6-1e03-104a-baeb-7fd09c9bedcb/Simulator_Screenshot_-_iPhone_Air_-_2026-06-16_at_12.13.34.png/1260x2736.png) ## ListenAid Rating Breakdown in Austria - 5 stars: 4 (100%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 0 (0%) - 1 stars: 0 (0%) ## ListenAid Available In - [Austria](https://apptail.io/app/listenaid-dfcw/austria) - [Azerbaijan](https://apptail.io/app/listenaid-dfcw/azerbaijan) - [Canada](https://apptail.io/app/listenaid-dfcw/canada) - [China](https://apptail.io/app/listenaid-dfcw/china) - [Ireland](https://apptail.io/app/listenaid-dfcw/ireland) - [Italy](https://apptail.io/app/listenaid-dfcw/italy) - [Norway](https://apptail.io/app/listenaid-dfcw/norway) - [Singapore](https://apptail.io/app/listenaid-dfcw/singapore) - [United States](https://apptail.io/app/listenaid-dfcw/united-states) - [Vietnam](https://apptail.io/app/listenaid-dfcw/vietnam) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*