Tododay is a day-to-day to-do list app. The user can place to-do that can be determined to be completed on a certain day or at a certain time in "Oneday", and will not be sure how long it will be completed when placed in "Someday." In addition, when the user completes the to-do, the to-do will be automatically placed in the "Completed", which is convenient for the user to backtrack. When creating a to-do, the user can choose whether to complete it at a certain time, or add a sub-to-do for this to-do, or choose whether to mark the item as "Important". If the to-do is marked as important, it will be highlight in all to-dos. In addition, users can choose whether to repeat the matter and customize the repeat interval.