OpenRoll Golf

OpenRoll is a digital green-speed meter. Roll a ball across the green, film it from above with your phone, and read the green's speed in feet. No ramp, no tape measure. HOW IT WORKS • Hold the phone flat above the green, camera pointing down at the line. • Putt the ball from the start circle so it stops in the box, then putt it back in the opposite direction. • Repeat the pair 3 or more times. OpenRoll times how quickly the ball slows down, and both directions together cancel out slope. • Each reading says how far to trust it, and asks for one more pair when the putts disagree. SEE THE SPEED BEFORE YOU PUTT • When other golfers have measured the greens at your course, OpenRoll shows the latest speed for the course and for the green you're on, and how long ago it was measured. Free, with nothing to measure yourself. KNOW YOUR GREENS • The course and hole are found from your location,…