PING's new iPING putter app helps you build a more consistent putting stroke and lower your scores. iPING is a free, wireless improvement tool that records the consistency of your stroke type, impact angle, and tempo. You can download the iPING app from the iTunes App Store for the iPhone 4 and the iPod touch (4th gen) beginning June 20. The iPING app works in conjunction with a PING cradle, which holds the mobile device and clips onto the putter shaft just below the grip.