ListenAid

see what you hear

$3.99

ListenAid - precise, clean & fast audio spectrum analysis. Turn your iPhone, iPad, or Mac into a high-precision audio measurement laboratory. ListenAid is a professional-grade Real-Time Spectrum Analyzer (RTA) and Spectrogram designed for audio engineers, acoustic consultants, musicians, and students. Built entirely on Apple’s Accelerate framework and Metal graphics, it delivers incredibly fluid, high-resolution analysis with zero lag. Whether you are tuning a PA system, analyzing room acoustics, or visualizing the harmonic content of an instrument, ListenAid provides the tools you need with the precision you expect. HIGH-PERFORMANCE VISUALIZATION - Metal-Accelerated Graphics: Experience a silky-smooth 60/120 fps display that visualizes audio data in real-time without draining your battery. - Hybrid View: View the instantaneous FFT spectrum and the scrolling Spectrogram history simultaneously. - Gestures: Pinch to zoom frequency and amplitude axes independently. Double-tap to reset. ADVANCED DSP ALGORITHMS - Standard FFT: Fast Fourier Transform with adjustable buffer sizes (up to 65,536 points). - Reassignment Method: A cutting-edge algorithm that sharpens spectral peaks, allowing for frequency precision that exceeds standard FFT limits (Sub-sample accuracy). - CQT & CWT: Variable-Q and Continuous Wavelet Transforms for musically relevant analysis. - Transfer Function: Compare a live signal against a reference signal (Dual-Channel Analysis). PROFESSIONAL AUDIO ROUTING - Multi-Channel Support: Fully supports external USB audio interfaces. Select specific input channels for measurement and reference. - High Sample Rates: Supports hardware sample rates up to 96kHz (and higher, hardware dependent) for high-resolution analysis. - Smart Bluetooth: Intelligently manages Bluetooth profiles to ensure high-quality monitoring without degrading input quality. SYSTEM TEST & TOOLS - Signal Generator: Built-in low-distortion Sine Wave generator. - Loop Player: Playback your own test loops or music directly from the app to test system response. - Cursor Mode: Inspect specific frequencies with a cursor showing Hz, dB, Musical Note, and Cents deviation. - Peak Tracking: Automatically detect and track the strongest frequencies with high-precision interpolation. MIDI REMOTE CONTROL - Control the MacOS app remotely via the iOS app. - Trigger loops, sweep a sine, toggle L/R-Solo, or invert polarity remotely while walking the room. TECHNICAL SPECIFICATIONS - True dual channel simultaneous independent real-time FFT - Window Functions: Hanning, Hamming, Blackman, Flat-Top. - Averaging Modes: RMS, Exponential, Peak Hold, Off. - Resolutions: FFT sizes from 256 to 65k. - Scales: Logarithmic (Hz) and Linear (Musical Note/Piano Roll). - Color Maps: Greyscale, high-contrast scientific color palette WHO IS THIS FOR? - Live Sound Engineers: Ring out feedback and tune systems using the built-in generator and transfer function. - Studio Engineers: Visualize the frequency spectrum of your mix in high detail. - Musicians: Use the precise Note/Cents cursor for instrument intonation. - Educators: Visualize sound waves and harmonics in the classroom. Privacy Policy: ListenAid processes all audio data locally on your device. No audio is ever recorded or transmitted to the cloud.

Ratings & Reviews

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- System Test: Audio Loop Sampler - MIDI remote for MacOS app - lots of fixes

Version 13

The developer, Michael Reisigl, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    • Provider
      • Michael Reisigl
    • Size
      • 4.3 MB
    • Category
      • Music
    • Compatibility
      Requires iOS 17.6 or later.
      • iPhone
        Requires iOS 17.6 or later.
      • iPad
        Requires iPadOS 17.6 or later.
      • Mac
        Requires macOS 15.3 or later.
      • Apple Vision
        Requires visionOS 1.3 or later.
    • Languages
      • English
    • Age Rating
      4+
    • Copyright
      • © 2025 teraBel
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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