Flo is a science-backed cycle, ovulation, pregnancy, and period tracker with over 530 million downloads worldwide.* Track your period (regular or irregular), predict ovulation, and learn to spot your fertile signs, follow changes to your baby and your body with a pregnancy tracker, and explore common perimenopause symptoms. Flo is here to support your whole menstrual cycle and female health journey. ? Is my data safe with Flo? Your health data deserves the highest level of protection. Flo is the first and only period tracking app with dual ISO 27001 and ISO 27701 certifications, internationally recognized as the gold standard in data protection. In 2025, Flo was recognized as ISO 27001/Information Security Management System Team of the Year at the PICCASO Privacy and Security Awards, honoring our excellence and commitment to privacy-first design. - Anonymous Mode: Use the Flo period tracker without linking your name, email, or personal identifiers. -...