Clue is a women-led, science-driven period and cycle tracking app that helps people understand their bodies across life stages — from first periods to pregnancy and perimenopause. Founded in 2012, Clue focuses on evidence-based features, strong research partnerships, and a privacy-first approach: the company does not sell personal health data and stores consumer health data under strict EU protections.

We build a mobile-first app that lets users track periods, symptoms, basal body temperature, ovulation tests, and more. Clue offers both a free product and a premium subscription (Clue Plus) with advanced predictions, personalized insights, pattern analysis, and expert content. Our data and platform also support academic and clinical research to advance women’s health.

Our mission is to push menstrual and reproductive health forward by making cycle data useful and accessible — for individuals and for research. We prioritize scientific rigor, transparent practices, diversity, and the protection of user data while partnering with leading institutions to close diagnosis and research gaps in women’s health.