Menstrual Periods Tracker

Track ovulation, fertile days, and pregnancy odds with a scientifically backed fertility tracker. Enter the first day of your last period and your typical cycle length to generate a personalized fertility calendar with ovulation predictions. Apple Health sync keeps your data up to date across all your Apple devices.

This extension offers two gender-prediction methods—Popular (Shettles theory) and Scientific (Rodrigo Guerrero data)—and lets you switch between them in Settings. The full version adds daily pregnancy probability, day-by-day fertility odds, and automatic Health sync. Note: all insights are probabilistic and for informational purposes only.