Ivory Pro Logo

Engineered for Acoustic Perfection

Ivory Pro is a professional hybrid DSP piano tuner for macOS, iOS, and iPadOS. Featuring Railsback stretch tuning curves, tailored physical instrument profiles, and sub-cent precision.

Professional Tuning Toolkit

Ditch the generic chromatic tuners. Harness an audio-engineering pipeline designed specifically for the unique physical properties of pianos.

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USB Audio Interface Support

Plug-and-play for Focusrite Scarlett, ZOOM iQ7, and any class-compliant USB audio device. Live mic info shows device name, sample rate, and channels. Adjustable 1×–10× software gain ensures optimal signal from professional interfaces.

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Inharmonicity Wizard

Measure overtones on reference notes (A1, A3, A5, C6). Our step-by-step wizard automatically builds a custom Railsback cents offset curve using professional 6:3 bass and 4:2 treble octave-harmonic matching models.

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Client & Profile Manager

Create, load, duplicate, edit, or delete custom client profiles. Adjust Railsback stretch coefficients dynamically from 1.0 to 4.0 and save all technician notes directly to the device database.

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Strobe Tuning Visualizer

Achieve the ultimate precision with a beautifully rendered, multi-band concentric strobe ring that dynamically rotates based on your exact phase offset.

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Harmonic Spectrum Analyzer

A lightning-fast 60fps FFT wave graph lets you visually inspect the harmonic partials of your strings to spot false beats and analyze overtone strength.

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Historic Temperaments & Overpull

Instantly switch to perfectly calculated Werckmeister III, Kirnberger III, or Meantone. Plus, a built-in Overpull calculator to perfectly compensate for tension drops.

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Auto-Calibrate A4 Reference

Auto-calibrate the A4 tuning reference (436–444 Hz) by listening to an external sustained tone or tuning fork. Filters out frequency outliers using a median-based estimator for maximum precision.

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Customizable DSP Physics

Direct manual control over physical needle response damping, response speeds, noise gate thresholds, and FFT smoothing window sizes.

Advanced Hybrid Engine

Employs McLeod Pitch Method (NSDF) with sub-harmonic filtering for low keys (A0-B0) and linear-magnitude FFT interpolation for the treble register (up to C8).

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Classic Pendulum Metronome

Synthesizes mechanical, wooden click, clock, and rimshot soundscapes with sample-accurate scheduling alongside classic, high-fidelity visual pendulum physics.

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Midnight Onyx Interface

A stunning, glassmorphic dark-mode environment optimized for dimly-lit studios, stages, and piano soundboard compartments with tactile pitch-lock haptic feedback.

Sub-Cent Mathematical Precision

Low frequencies in a piano are highly transient and have extremely weak fundamental frequencies, whereas high frequencies are short and decay rapidly. Traditional tuners fail at both extremes. Ivory Pro handles them with state-of-the-art DSP:

  • Bass Octave Stabilization: Sliding circular accumulator ensures the McLeod Pitch Method (NSDF) always operates on a complete period, eradicating low-end blindness.
  • Linear Peak Search: By replacing standard power spectrum parabolic FFT interpolation with linear amplitude interpolation (via Accelerate SIMD vvsqrt), treble tracking errors are mathematically resolved.
  • Dynamic Haptic Tracking: Subtle, microscopic haptic impulses pulse right in your hands to indicate when a string is perfectly in lock-step alignment.

Hybrid DSP Architecture

Automated real-time handoff between NSDF and linear-interpolated FFT based on frequency thresholds.