ListenAid vs SoundScope

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.

See your sound. SoundScope turns your iPhone and iPad into a complete audio analysis instrument — spectrum, loudness, stereo field, and dynamics, measured with broadcast-grade precision and rendered in a stunning brushed-metal interface. Whether you're mixing, mastering, running live sound, tuning a room, or you simply love watching music breathe, SoundScope shows you what your ears alone can't catch — and tells you how to fix it. — FOUR WAYS TO SEE YOUR SOUND — • SPECTRUM — high-resolution real-time analyzer with bars or silky line mode, animated peak hold, 20 to 120 bands, logarithmic or linear scaling • SPECTROGRAM — scrolling waterfall with a gorgeous inferno heat map, 20 Hz to 20 kHz • RADIAL BLOOM — an ambient circular analyzer with a core that pulses to the beat • RIBBON TUNNEL — a mirrored neon ribbon that turns your desk into mission control — BROADCAST-GRADE LOUDNESS — A full ITU-R BS.1770 loudness suite: Momentary, Short-term, and gated Integrated LUFS, Loudness Range (LRA), intersample True Peak (dBTP), and a DR dynamics score. Know exactly how loud you are before you upload — not after. — A MIX ENGINEER IN YOUR POCKET — The built-in diagnostics engine listens with you and speaks plain English: clipping alerts, loudness-war warnings, crushed dynamics, mono sub-bass cancellation, and frequency-balance issues — all judged against genre profiles for EDM, Hip-Hop, Rock, Classical, Acoustic, and Podcast. It even tells you how far streaming platforms like Spotify and YouTube will turn your track down. — READ THE STEREO FIELD — Stereo VU meters with peak hold, a live stereo-image scope, Mid/Side spectra, and a phase-correlation meter. Per-band RMS from sub to air, plus a mono-compatibility strip that shows exactly where your mix collapses in mono. — SURGICAL CONTROL — FFT sizes from 64 to 131,072 with TRANS / BAL / MASTR presets, overlap up to 93.75%, HOLD to freeze and inspect any moment, and input sensitivity from 0.1x to 4x. — ANY SOUND. ZERO SETUP. — Point it at your studio monitors, a live PA, an instrument, or a track playing back — through the built-in mic or any connected audio interface. Rotate to portrait for full metering, landscape for the analyzer. — DESIGNED TO BE LIVED IN — A luxurious brushed-metal instrument with tactile controls, haptic feedback, and eight accent themes — including a live per-frequency Spectrum rainbow. Full dark-mode and Reduce Motion support. — PERFECT FOR — • Studio engineers, producers, and mastering • Live sound and FOH engineers • Musicians, vocalists, and podcasters • Acousticians, installers, and educators • Anyone serious about sound No subscriptions. No accounts. No sign-in. No telemetry. Everything runs on-device and offline, with Apple-native engineering that stays silky-smooth on iPhone and iPad. Stop guessing. Start seeing. Download SoundScope and hear with your eyes.