AnaHertz

AnaHertz is a useful application that gives you access to the sensors built into your iOS device.  It provides you with simple controls to capture and analyze linear acceleration and angular velocity.  This tool captures and plots sensor data on either individual graphs or combines data plots onto a common graph for easily comparison.  You can view a few stats (min, max, and dominate frequency) about the sensor data or generate frequency spectrum analysis plots for the entire sampling window or for a select range of time.  Additional options include specifying sampling rate, sampling time, repeat times for periodic sampling and more.  Sensor and frequency spectrum data can be exported via email along with a screen shot of the graphs.