Handheld Acoustic Analyzer
ToneWood records tap tones with an iOS device microphone and combines them with dimensions and weight you enter to calculate, save, and share tonewood measurements. Results depend on the device, environment, and technique.
Compatible with iPhone and iPad (iOS 17.6+)
The ToneWood app integrates a full suite of digital tools designed for professional workshop material profiling.
Records wood taps and checks signal strength, clipping, and decay quality. A quiet space and consistent technique improve repeatability.
Runs Fast Fourier Transform (FFT) on recorded knocks to isolate raw frequency peaks and calculate damping coefficient.
Solves physical dimensions and weight inputs to yield raw density, elastic modulus, radiation index, and acoustic impedance.
Formats structured measurements, a serial number, and a QR code into a printable record for inventory labeling and sharing.
When you choose public visibility, structured measurements sync to ToneWood online. Scanning the QR code opens the matching public record.
Consistent holding and tapping positions help produce cleaner Mode 5 resonance data. Follow the in-app measurement guidance.
Pinch the violin plate between your thumb and forefinger at the intersection of the Mode 5 nodal line (typically on the center-axis, about 2/5ths or 40% from either the top or bottom edge - marked in red). This prevents dampening of the mode-5 vibration.
Gently tap the center of the plate (marked in green) using your knuckle or a soft wool hammer. This is the point of maximum amplitude for Mode 5, producing the loudest resonance.
Ensure background noises (fans, dust extractors) are minimized. The App automatically detects transient knocks, trims the audio file, and executes a Fast Fourier Transform (FFT) on the strike.
Under the hood, ToneWood utilizes classic physical equations to convert wave velocities and weight data into elastic metrics.
Sound speed is calculated from the Mode 5 resonant frequency ($f_5$), calibrated against Chladni dimensions for standard small plates.
Young's Modulus represents longitudinal stiffness, derived from wave propagation speed squared multiplied by raw wood density ($\rho$).
Acoustic radiation coefficient. It measures the rate at which wave vibrational energy is converted to acoustic radiation in air.
Join thousands of acoustic builders and tonewood suppliers who rely on ToneWood to quantify their craft.
Download on the App Store