Improvement in bowling, and sports in general, takes a significant amount of time and practice. Our goals are to assist bowlers in building throw consistency, to provide guided improvement, and to create an overall better bowling experience. Striker is a mobile application for both Android and iOS devices that integrates with an external microcontroller placed within a bowling ball to gather data about bowling throws. The microcontroller uses an accelerometer and gyroscope data to collect the speed, rotation, and tilt of the bowling ball during the swing and after the release. This data is sent to our mobile application and displayed to the user is a readable manner. In the best case scenario, the only information that bowlers have available to them is their throw speed. This makes maintaining consistency throughout throws difficult. Striker gives users a detailed look into every throw and provides them not only with the data collected by the device but also corrective advice.