Clue is a period tracker and pregnancy app that provides users with the power of science and the support of fertility experts. The app helps users understand their bodies and live in sync with their menstrual cycle. Clue is more than a period diary, it is an ovulation tracker, period, and pregnancy calendar that guides users through all their cycle's stages. Founded and led by women, Clue is safe, inclusive, and one of the only period apps entirely based on science. Users can trust Clue as their period calendar, ovulation tracker, and fertility friend.

Clue Period Tracking empowers users to become the expert on their own body, with 100+ cycle tracking categories for things like birth control, ovulation pain, PMS, and menstrual flow. The more users track, the better Clue can pinpoint their future period dates, identify patterns in their cycle, and provide valuable insights on their unique menstrual cycle to discuss with their OB/GYN for more effective care. Clue also helps users track ovulation easily, without temperature checks, and get accurate fertility predictions.

Clue Pregnancy tracking provides users with step-by-step support and pregnancy week-by-week guidance. Users can set their due date countdown with a pregnancy calculator and learn what to expect with weekly pregnancy highlights, including tips and suggestions from Certified Nurse Midwives. A subscription to Clue Plus grants users all-in access to Clue Period Tracking, their personal ovulation calculator, and pregnancy app features. Clue Plus includes 6 months of advanced ovulation, fertile day, and period predictions, tips, advice, and expert answers to reproductive health questions, and Clue Pregnancy Mode for a week-by-week pregnancy calendar.

Overall, Clue is an easy-to-use menstrual cycle tracker that helps users personalize their period tracking, plan around their period, ovulation, and fertile days, and learn the science behind their cycle with health articles that span sex, PCOS, fertility, and pregnancy, written by Clue's in-house Science Team.