Flo Cycle & Period Tracker

Flo is a science-backed period tracker, ovulation tracker, fertility, and pregnancy app used by over 460 million* women worldwide. Whether you’re tracking your period (regular or irregular), trying to conceive, following changes to your baby and your body during pregnancy, or navigating perimenopause symptoms, Flo is here to support you. Join 460 million users* who use Flo’s science-backed insights, created with 100+ doctors and medical experts, to better understand their menstrual cycle. Is my data safe with Flo? Your health data deserves the highest level of protection. Flo was recognized as ISO 27001/ISMS Team of the Year at the 2025 PICCASO Privacy and Security Awards, honoring our excellence in information security management and long-standing commitment to privacy-first design. - Anonymous Mode: Use the Flo period tracker without linking your name, email, or personal identifiers - Dual ISO certification: Industry-leading security standards to keep your data safe - Secret Chats: Connect with like-minded members who share tips and personal experiences Why choose Flo for period and ovulation tracking? Flo is more than a basic calendar — it’s a smart period tracker designed to help you notice patterns over time. - Log 70+ symptoms and moods to receive more personalized menstrual cycle insights - Support for irregular periods, pre-period symptoms, and cycle changes - Clear summaries you can share with your doctor - An accurate period tracker to help you plan ahead with confidence (Flo is not a method of birth control) Can Flo support my Trying To Conceive (TTC) journey? Flo offers educational features to support your journey to conceive and better understand fertility. - Fertile window and ovulation predictions based on your logged period data - BBT (basal body temperature) tracking - Daily insights to help you prepare to conceive a baby - Partner tools to support shared awareness How does Flo support my pregnancy by week? Once you conceive, switch to Flo