Clue is a femtech company that offers an app focused on menstrual cycle tracking and reproductive health.

Clue’s mission is to provide trustworthy information, data-driven tools, and emotional support for everyone with a menstrual cycle — as an empathetic, scientific companion from first period to last period.

Clue was founded in 2013 by Ida Tin, Hans Raffauf, Moritz von Buttlar and Mike LaVigne. The company is headquartered in Berlin, Germany. Clue is currently available in 17 languages and growing.

Clue' combines science and technology to allow women to learn, access, and talk about menstrual and reproductive health around the world. The technologies within this category include fertility solutions, period and fertility tracking apps, reproductive system health care, etc.

Clue' app calculates and predicts users’ periods and PMS based on users’ data and calculates fertility windows based on global averages, which can be made more accurate by users’ entering ovulation test data.

Clue launched Clue Plus, which offers enhanced Analysis and personalized predictions for cycle-related symptoms with Forecast. Clue also created Clue Conceive, a mode in the Clue app that can help increase your chances of getting pregnant. Clue has over 11M active monthy users in 190 countries.

Clue is backed by Union Square Ventures, Balderton Capital, Mosaic Ventures, Groupe Arnault, Future Positive Capital, and others. The company raised €7M ($7.6M) in a new round on Apr 04, 2023. This brings Clue's total funding to $55.6M to date.