Guitar Tap - capture resonant frequencies with this app for Mac, iPhone, iPad, Windows and Linux

Improve your guitar quality by tapping. Guitar Tap captures the sound of a tap on a guitar, tonewood plate, or brace, runs a high-resolution FFT, and reveals the resonant peaks and material properties that matter to luthiers. Use the results to guide your bracing, mass distribution, and plate thickness — methods drawn from Contemporary Acoustic Guitar Design and Build by Trevor Gore and Gerard Gilet.