A collection of useful tools for tenpin bowlers and coaches including: - Angles & Targeting - Adjust your targets to show a shot on the lane and work out the exact path the ball should take from the start of the approach. - Axis Tilt & Rotation - Take a picture or video of your ball with a PAP (Positive Axis Point) marker and position it beneath the guide to get an approximate measurement of your axis tilt and rotation. - Ball Speed & RPM - Calculate the speed the ball travels down the lane. Use a video for greater accuracy and slow the video down to measure rev rate. - Observation Trainer - Watch shots traveling down a simulated lane to test and improve your ability to observe ball motion. - Score Calculator - A calculator for bowling scoring and a great way for beginners to learn how the scoring system works. - Spare Names - Just for fun, tap on the pins to see the nicknames of common spares.