Clue Period Tracking App
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Unlock deeper cycle insights and discover your unique patterns.
10 million people in over 190 countries rely on our app.
Our content is science-based and written by reproductive healthcare clinicians and science writers to provide people with essential, evidence-based education about health, periods, and sex via helloclue.com.
monthly active users
monthly reach on web and social
We strive to create an app that’s accessible to our diverse community of users, taking into account gender, age, race, ethnicity, accessibility, education, country of origin, socioeconomic status, and all the other aspects of an individual's background. Clue is currently available in 20 languages and growing.
One of Clue’s co-founders, Ida Tin, coined the term femtech in 2016 to define the group of technologies that are designed to support and advance women’s healthcare.
The technologies within this category include fertility solutions, period and fertility tracking apps, reproductive system health care, women’s sexual wellness products, pregnancy and nursing care, period care goods, at-home fertility monitoring devices and general healthcare.
Co-founder & Chairwoman
Ida knew immediately that in order for these products to be taken seriously, the market needed to be defined, so she suggested that Clue should begin to call itself a femtech company.
By defining the group of products that are associated with female health, we are creating an entirely new category of technology. Grouping these technologies paves the way for femtech conferences and VC’s to invest in femtech and create even more products within this segment that are important and needed in the world.
We 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.
Everyone with a cycle is empowered to make informed choices for themselves around menstrual, sexual, and reproductive health and well-being.
We earn people’s trust by honoring their privacy, being transparent about how we use their data, and providing them with honest and accurate health information.
Care is at the core of everything we do, both in how we support and communicate with people, and in the products and technology we create for them. We genuinely wish to help them improve their lives and live more fully.
Rooted in science, Clue’s brand and products were born out of research and data. We continually strive to find the most accurate, forward-thinking information on menstrual and reproductive health, only sharing what we confidently believe in and can provide evidence for.
Clue founded in Berlin by Ida Tin, Hans Raffauf, Moritz von Buttlar and Mike LaVigne
The Clue app is launched on iOS
The Clue app is launched on Android
Clue raises a seed round of €500k
3 million monthly active users
Clue announces Series A funding
American College of Obstetrics and Gynecology (ACOG) rated Clue the number one period tracking app
Clue announces Series B funding
Clue Plus, the paid version of the Clue app, is launched
Launched the #justsayperiod campaign
HelloClue.com Encyclopedia for menstrual and reproductive health goes live
Clue collaborates with researchers at Oxford University on study on the impact of STIs on premenstrual symptoms
Irregular Cycles feature launched to help users identify symptoms of PCOS
First season of the Hormonal podcast goes live
Work begins with the Bill and Melinda Gates Foundation to explore how Clue can support global reproductive health research
Clue collaborates with researchers at the Kinsey Institute to publish study on global condom use during menses
Clue Pregnancy mode launched
Content Tab added to the app
Audrey Tsang and Carrie Walter become Clue’s co-CEOs
Clue Birth Control gets FDA approval
Clue announces funding for development and rollout of medical-grade features
Clue Birth Control piloted in the US
Clue Conceive is launched on iOS
Clue data is paired with survey data for study on COVID-19 and the menstrual cycle
Clue app redesign is released
The Clue app becomes CE marked as Class 1 medical device
Clue Conceive is launched on Android
Clue together with the Bill and Melinda Gates Foundation, releases study on heavy menstrual bleeding (HMB)
Record-breaking equity crowdfund with over 5000 individual investors (85% female)
Clue Perimenopause is launched
Audrey Tsang becomes CEO
Health Conditions feature is added in-app to help close the diagnosis gap
Accurate, informative, easy to use! The clean and fun design makes tracking your cycle, dare I say, fun?
Clue is such an invaluable app! As someone with PCOS and other health conditions that contribute to painful and irregular cycles, Clue has helped me to see patterns in my cycle.
This app is almost scary with how accurate it is in prediction of ovulation and menstruation times. I'd give 10 stars if I could.
Audrey Tsang (Clue’s former Chief Product Officer) became Clue’s Co-CEO in March 2021, and sole CEO in October 2023. She champions a user-first, insight-led approach to product innovation. Audrey firmly believes in the potential of tech and data-driven self-tracking to help close the empathy gap in female healthcare.
Audrey Tsang, CEO
Rhiannon White CPO
Greg Ryzhov CTO
Sarah Ottawa Head of People
Amanda Shea PhD Head of Science
Check out the links below to see what we've been up to.
Clue Period Tracking App
Clue webinars for clinicians
Clue is a menstrual tracking app, an encyclopedia, a resource for your health, and more. Here are all the posts...Go to topic page
The recent overturning of Roe vs Wade has not only changed the landscape of reproductive rights in the US, it...
We never have and we never will.
We do not sell your health data, we protect it and we will not disclose it