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Clue

25 billion health data points women actually trust

Clue helps anyone with a menstrual cycle discover unique health patterns, and take control of their reproductive lives.

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Their mission
Empower people on the journey to self-discovery
Challenge
Health for All
HQ
Berlin, Germany

Their UVP

Clue helps people understand their cycles and reproductive health through accurate, science-based tracking. With millions of active users, it has built one of the most trusted datasets in female health, used for personalized insight and research.
Group 2313
Grand challenge

Women's health

1%
Of global biopharma R&D funding goes into female health conditions, despite women representing 50% of the population
100 million+
People worldwide who have used Clue to track their cycles since launch in 2013, across 190+ countries
1M
paid Subscribers, reached in May 2025, doubling Clue's paying user base in a single year, with conversion rate up from 3.7% to 9.3% over two years

While 50% of our global population are women, the women’s health market represents a mere 0.3% of the $10 trillion spent on health annually.

As scientists now agree that women’s health patterns are very different from men’s, the opportunity for products and services that cater to women is enormous. Women want (and need) better health information and services at each stage of their lives, yet female health remains vastly underfunded and underserved.

The lack of historical research focused on female health contracts with – and is sometimes a cause of – the higher risk that women face with some of the most challenging conditions. Autoimmune diseases, for example, affect approximately 8% of the global population, but 78% of those affected are women. Women are 3x more likely than males to develop rheumatoid arthritis and 4x more likely to be diagnosed with multiple sclerosis, an autoimmune disease that attacks the central nervous system. These male-female disparities are present across the medical world – for pathologies like Alzheimer’s, heart attacks, or chronic pain conditions. The innate differences between males and females, and the deficiencies in research, have sometimes led to terrible consequences. 80% of the drugs removed from the US market from 1997 to 2000 were withdrawn because of side effects that occurred mainly or exclusively in women.

This major medical discrepancy is the root of the “femtech” movement, which defines a group of technological products and services designed to support and advance women’s health. These include fertility solutions, period and fertility tracking apps, reproductive system health care, women’s sexual wellness products, pregnancy, post-pregnancy and nursing care, period care goods, at-home fertility monitoring devices, or next-generation breast pumps.

Why did we invest?

10M monthly active users

FOUNDERS
1766419948537
Rhiannon White, CEO
Ida Tin 1
Ida Tin, co-founder & Chairwoman

We were introduced to the team at Clue after deep-diving into femtech. We had already built conviction that femtech was a challenge and a market opportunity worth investing in. We quickly realized that Clue stood out from the pack.

Clue is the pioneer of the femtech industry. The company was founded in Berlin in 2012 by Ida Tin, who coined the term "femtech" and now chairs Clue's board, alongside co-founder Hans Raffauf. Their period tracking app is now used by more than 10 million people every month across 190+ countries, built on a trusted consumer brand grounded in science-based education and privacy protection.

Clue's scientific credibility shows in partnerships with top research institutions to advance female health, from Stanford on menstrual cycles' impact on mood and vital signs to Columbia, the Gates Foundation and Johns Hopkins.

The fallout of the US Supreme Court's vote to overturn Roe v. Wade put Clue's focus on trust and privacy in sharp relief. As calls arose to delete period tracking apps, Clue emerged organically as a trustworthy option, through data de-identification and encryption, a business model that does not rely on selling data, and honest communication.

In 2021, Clue cleared regulatory barriers to deliver the world's first FDA-approved, clinically proven data-driven fertility awareness method of contraception. Since Rhiannon White became CEO in September 2024, the company has crossed major commercial milestones, reaching one million paid subscribers in May 2025 and doubling its paying base in a year, with free-to-paid conversion climbing from 3.7% to 9.3%. New partnerships with Oura, Headspace, Ultrahuman and Evaro, a UK NHS-licensed platform delivering NHS-funded contraception in-app, extend its reach, while Dr. Charis Chambers has joined as Chief Medical Officer.

The platform now holds one of the world's largest reproductive health datasets, 25 billion health data points and 750 million cycles analyzed.

CO-INVESTORS
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