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Hormone-free birth control + advanced cycle insights, all in one app. Meet the world's first FDA-cleared birth control app. A whole new category of birth control — The Natural Cycles° algorithm analyzes hormone-driven temperature changes to identify your fertile and non-fertile days. Seamlessly measure overnight with Oura Ring or a compatible wearable and wake up to personalized fertility insights in the Natural Cycles° app. Join the millions who are taking control of their fertility with NC° Birth Control.