Period Tracker is the perfect app to track your periods thanks to a complete control system that lets you know which days you are most fertile. It's so simple and easy to use that you won’t want to try any other app. You simply have to set the dates in which your period started and ended on the calendar. With these two bits of information, Period Tracker will tell you when your next period will start, as well as which your fertile days are and when you are ovulating, all with great precision and only a 2-day margin of error. Apart from this, you'll also be able to record and track all of the symptoms you suffer every month thanks to the long, detailed list provided, which includes how much acne you have, backaches, bloating, body pain, cramps, cravings, nausea, and any other symptoms which a woman can experience during those days. You can also add the exact days in which you've had sexual relations in order to make your own calculations, or you can record what mood you're in at the time. Finally, you can access your complete file and see how many days long your cycle has been.