Green and Red color tint options along with other filter settings.
Prevent Screen from turning off or going to sleep using the Keep Screen On Option.
Easy Access through 5 function Widget.
Works in both Orientation: Portrait and Landscape
Notification to reduce eye strain using 20-20-20 rule.
Small apk size
* Read About 20-20-20 Rule : https://bitforhealth.wordpress.com/2017/02/26/20-20-20-rule/