Natural Cycles is a health technology company offering a hormone-free birth control solution powered by an FDA-cleared and CE-marked algorithm. The algorithm uses body temperature to identify fertile and non-fertile days, supporting women in preventing or planning pregnancy with personalized precision.

Natural Cycles provides a free thermometer or syncs with wearable devices such as Apple Watch or Oura Ring. Users take their temperature upon waking, and the app displays fertility status, cycle trends, and helpful insights. The app also allows tracking of mood, energy, and other cycle impacts.

The effectiveness rates are 93% with typical use and 98% with perfect use. Natural Cycles emphasizes privacy, never selling user data, and offers subscription options to sustain its product. The company also supports users with expert content and a supportive community.