A free program for Android, by HeaFit – Healthy and Fitness.

This Period Tracker & Ovulation app is a fully functional menstrual tracker with a clean, soft, and intuitive user interface.

If you tend to rely on the element of surprise every month, this may be the opportunity to get to know your body much more intimately and understand its monthly rhythm. If you are trying to get pregnant, being attuned to your cycle will help you with this goal.

This health app features an ovulation calendar that helps you better predict your upcoming cycle, as well as a schedule reminder. It will also provide you with the more intimate and helpful details – such as the days when you are most likely to get pregnant, or your safe date.