A period and ovulation tracker app is a mobile application that helps users track their menstrual cycles and predict when they are most likely to ovulate. These apps can be useful for women who are trying to get pregnant, as well as those who want to monitor their menstrual cycles for other reasons, such as managing their menstrual symptoms or tracking their overall health.

To use a period and ovulation tracker app, users typically enter information about their menstrual cycle, such as the date of their last period, the length of their cycle, and any symptoms they are experiencing. The app will then use this information to predict when the user is most likely to ovulate, as well as when their next period is expected to start. App also allow users to track other information, such as their basal body temperature, cervical mucus, and sexual activity, which can help to improve the accuracy of the ovulation predictions.