This is an app that clears your mind of anything that needs to be completed. Every morning you think about tasks that you need to do that day, and Checkbox will keep track of them. You go through your day as you normally do, slowly checking off completed tasks in Checkbox. At the end of the day, you go through your list and delete all your completed tasks. The next day, you start this process over again. Checkbox is supposed to replicate pen and paper checklists, in which you can easily access your todos and check them off.