Natural Cycles

Natural Cycles represents a paradigm shift in digital health, serving as the world's first FDA-cleared and CE-marked contraceptive app. Unlike traditional calendar-based methods, Natural Cycles utilizes a sophisticated bio-statistical algorithm that analyzes Basal Body Temperature (BBT) and luteinizing hormone (LH) levels to determine an individual's daily fertility status with 93% effectiveness under typical use and 98% under perfect use. By 2026, the platform has matured into a comprehensive hormone-health ecosystem, moving beyond manual temperature entry to seamless sensor-fusion via integrations with Oura Ring and Apple Watch. The technical architecture focuses on noise-reduction in biometric data, account for factors like sleep disturbances, alcohol consumption, and illness that might skew thermal readings. Its market position is solidified by a rigorous adherence to data privacy standards, particularly critical in the post-Roe landscape, utilizing end-to-end encryption for sensitive reproductive data. The service provides specialized modes for contraception (NC° Birth Control), pregnancy planning (NC° Plan Pregnancy), and gestation monitoring (NC° Follow Pregnancy), making it a lifelong reproductive health partner rather than a single-use utility.