Three functions assist putting. GREEiN

GREEiN is the most powerful green reader app that analyzes the grain and
slope of grass, which even professionals find difficult to read.
This is the best training app for those who want to improve their green reading skills!
This easy to use and stylish app has three main functions.
GRAIN reader uses your phone’s camera to analyze the orientation and
strength of the grain.
The SLOPE reader uses your phone’s accelerometer to analyze the
direction and angle of the tilt.
The PUTT reader analyzes both at the same time, making it easier to
guess the direction in which the ball rolls.
All the information necessary for putting is in your fingertips!
With GREEiN, you can learn how to read the green and enjoy putting.

GREEiN can be used for practice, to improve your green reading ability, for personal golf, to improve your score, before competitions, to check the condition of the green in advance, and in many other situations.
*Please refrain from using it during the meeting as it is against the rules.
Also, please follow the regulations of golf organizations and golf courses.