GREENONグリーンオンアプリ is a free Android app developed by GREENON for golf enthusiasts. The app lets you view and manage play data acquired on the golf course through Bluetooth communication with the GREENON golf watch. You can also transfer pin position data, change the watch's system settings, and update course data and firmware. The app has a database of golf course information from all over Japan, allowing you to view course location, yardage, hole layout, and simulation, as well as enter and manage scores and calculate competition/Olympic points for up to four players.

The app also allows you to receive and play voice memos and GPS logs (running) data (only available with the GREENON golf watch A1, A1-II, A1-III, and Smart). You can also migrate data from the GO smart and GO sport+ apps. However, the SPORT+ app has been discontinued, and users of the Smart/Sport Plus watch are encouraged to use the GREENON app instead. The app requires Android 6.0 and above and Bluetooth 4.0 and above to function correctly.