You may have forgotten the exact time of your menstrual month last month, or you may not know that your menstrual cycles are several days old and have almost no information about your menstrual cycle. The RedDays app has made it easy for you. If you are one of those who are marking their menstrual history, you can record your last menstrual period in this app and easily calculate the length of your app in addition to keeping you informed of the length of time you have until your next menstruation. It will show you graphs of your menstrual cycle and if you are on the contrary those who only rarely remember their last menstrual date, this app will work for you.