Natural Cycles

Natural Cycles is the world's first FDA-cleared digital contraception and fertility tracking app, making it one of the most rigorously validated cycle tracking tools available. While it is primarily known as a contraception method, its body temperature-based (BBT) tracking approach makes it particularly useful for women with PCOS who want to understand their cycles at a deeper biological level.

For PCOS women, Natural Cycles works differently from calendar-based apps: it measures your basal body temperature each morning and uses an algorithm to detect ovulation based on the thermal shift that occurs after the egg is released. Because PCOS often causes delayed or anovulatory cycles, a BBT-based approach is far more informative than calendar predictions, helping you see if and when ovulation actually occurred each cycle.

The app is available on iOS and Android and requires a subscription. It can be used with the included thermometer or compatible third-party basal thermometers. Its data visualization tools help you see cycle patterns over time — useful for tracking how lifestyle changes like diet, exercise, or stress management are affecting your cycle regularity.

For PCOS women interested in understanding their ovulatory function through temperature data, Natural Cycles provides a scientifically validated framework that goes beyond the surface-level tracking offered by most period apps.