Forest is an application that makes you stay focused by planting and timing a tree. If you want to drop your phone for a while to deal with something more important, plant a seed in the forest. The seed grows into a tree. But if you exist the app, the tree will die. It's fun and really helps to stay focused. Try it now. Download links are below
https://itunes.apple.com/app/forest-stay-focused-stop-phubbing/id866450515
