PERIOD. Cycle & Period Tracker

PERIOD. is a privacy-first period and cycle tracker from a women-led team in the Netherlands. Track periods, cycles, symptoms, moods, sleep, pain, PMS and more with reminders, cycle calendars, phase explanations, and personalized ovulation and fertile-day estimates. Support is included for irregular cycles, PCOS, endometriosis, trying to conceive, pregnancy and postpartum tracking.

Your health data is encrypted and stored on EU servers, with no advertising, third-party trackers, behavioral ads or data selling. Export your cycle history as a PDF for your doctor, ask personalized AI questions, or delete your data at any time. PERIOD. is not a medical device, and its predictions should not replace professional medical advice or be used as contraception.