Ovulation calculator, fertility tracker and period calendar OvTracker is the app that fits your needs. Once you have recorded the first date of your last period and the number of days of your menstrual cycle, your period, ovulation and fertile days will be displayed in a user-friendly way. OvTracker is an ovulation calendar app, and at the same time a fertility calculator that: - Spots the expected ovulation day and your most fertile days. - Tracks your menstrual cycles and your chances of getting pregnant day by day. - Displays up to ten predictive menstrual cycles seamlessly. - Supports irregular cycles by including your cycles history in the calculation process. - Becomes more precise after 10 recorded cycles. - Alerts you when your period, fertility or expected ovulation day is coming. - Allows you to take notes and record your intercourse. NB: OvTracker app provides an estimate of your fertile window and is not a guarantee of pregnancy or of birth control.