The requirements to use the iPerfectPutt App are:

• iOS 5 or later
• iPhone/iPod with accelerometer/gyroscope sensors (iPhone 4 or later, iPod Touch 4th-generation or later)
• iPhone/iPod mount that clips or clamps to the putter shaft

 Mounting Your iDevice 

This app requires a mount that holds your iDevice (iPhone/iPod) rigidly against your putter. We recommend the iPing^TM Cradle, available at the Apple Store and several golfing supply retailers.

Other options include mounts that clamp onto microphone stands or bicycle handlebars, though you may find that these types of mounts change your putter's feel and balance. The mount must not allow your iDevice's orientation (relative to the shaft) to change while you use this app.