Know your body like never before with the period tracker you can trust. Clue is the #1 women-led period and cycle tracker created by women to transform menstrual cycle tracking into a deep understanding of your hormones and reproductive health. Clue helps you make sense of your menstrual cycle at every life stage – track your period, fertility, ovulation, and pregnancy with the cycle tracker backed by science and protected by strict EU data privacy law. Explore 300+ expert-written guides on menstrual cycles, fertility, pregnancy and more, all inside the app. The more you track, the more you know. Women-led, science-based, privacy-first ? Free period tracker with calendar view to plan with confidence • See when your period is coming with Clue's period calendar. • Track your period alongside over 200 factors like mood, energy, sleep, and sex drive to see how they relate to your menstrual cycle. • Spot patterns in your menstrual cycle regularity and peri...