The Nr.1 green-reading app

How to use the app


This section contains explanations of the used terms and notations as well as links to further material.
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Explanation of used terms and notations

Points according to the PUTTALYZE concept

Distances and lines according to the PUTTALYZE concept

  • dA: Distance between the hole and the aim point PA. More
  • dD: Distance between the aim point PA and the distance point PD. More
  • dP: Distance past the hole; the distance from the hole to the point where the ball would stop, if it did not fall into the hole. More
  • dC: Distance corresponding to a putt on a plane surface. More


The point on the fall line that indicates the initial direction of the putt. 

Distance point (PD):

The point on the line of the initial put direction that indicates the eff ective length of the put, i.e. the distance correspondingto a put on a flat surface (with the same green speed and velocity at the target). 

Error in putt direction: Deviation (in degrees) of the putter from the calculated initial direction; helps to visualize the error margins.
∆φ: ("Delta-phee"): Angle between the initial putt direction and the straight line from the ball to the hole.



General concepts
Stimp-meter distance (Ds): The distance in feet that a golf ball rolls when launched from a Stimp-meter on a flat surface.
Fall line: The fall line is the direction of maximum slope (SLmax).