Clue Period Tracking App
Available on iOS and Android in 20 languages, the Clue app features cycle predictions, analyses, and educational content.
Read more here
Now you can sync Oura with Clue
Unlock deeper cycle insights and discover your unique patterns.
About Clue
Clue is a period tracking app, a trusted menstrual health resource, and a thought leader in femtech.
By combining science and technology, we are actively changing the way people learn, access, and talk about menstrual and reproductive health around the world.
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.
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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.
What is “femtech”?
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.
Ida Tin,
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.
Mission
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.
Vision
Everyone with a cycle is empowered to make informed choices for themselves around menstrual, sexual, and reproductive health and well-being.
Values
Trust
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
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.
Science
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.
Milestones
2012
Clue founded in Berlin by Ida Tin, Hans Raffauf, Moritz von Buttlar and Mike LaVigne
2013
The Clue app is launched on iOS
2014
The Clue app is launched on Android
Clue raises a seed round of €500k
2015
3 million monthly active users
2016
American College of Obstetrics and Gynecology (ACOG) rated Clue the number one period tracking app
2017
Clue Plus, the paid version of the Clue app, is launched
Launched the #justsayperiod campaign
2018
Clue launches the content Encyclopedia: http://helloclue.com
Clue collaborates with researchers at Oxford University to publish a study on the impact of STIs on premenstrual symptoms (https://pubmed.ncbi.nlm.nih.gov/30090631/)
2019
Clue launches Irregular Cycles feature, helping users identify symptoms of PCOS
Clue releases Season 1 of podcast “Hormonal” on iTunes, Spotify, and SoundCloud
Clue kicks off research project with the Bill and Melinda Gates Foundation to explore how the Clue app can support reproductive health research globally
Clue collaborates with researchers from the Condom Use Research Team at the Kinsey Institute to publish research on global condom use during menses
2020
Launched Clue Pregnancy mode
Added Content Tab to the Clue app
Launched Clue Pregnancy mode
2021
Received FDA clearance for Clue Birth Control
Audrey Tsang and Carrie Walter become Clue’s co-CEOs
Clue introduces the Flex Friday policy
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2M+ ratings
Why people love Clue
Accurate, informative, easy to use! The clean and fun design makes tracking your cycle, dare I say, fun?
Nicole Layton
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.
Sophie Purdie
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.
Esther Mungai
Proudly female founded and led
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
We’re always working on something exciting
Check out the links below to see what we've been up to.
Clue Encyclopedia
We create content around menstrual health, written and fact-checked by clinicians and science writers.
Read more here
Hormonal Podcast
A podcast about hormones and how they shape our world, hosted by Rhea Ramjohn.
Read more here
Clue webinars for clinicians
Explore Clue webinars and find evidence-based resources for your patients.
Read more here
Clue Press
Our work and leadership has been praised by some of the world’s leading publications.
Read more here
Clue Privacy Policy
Data privacy is at the core of what we do: we never have, and never will, sell our users’ data.
Read more here
Clue Newsletter
Subscribe to our newsletter to get science-backed articles and our latest updates.
Check out what goes on behind the scenes at Clue
About Clue
Clue is a menstrual tracking app, an encyclopedia, a resource for your health, and more. Here are all the posts...
Go to topic page
About Clue
Learn more about your body with Clue Plus
When you subscribe to Clue Plus, you don't only get new features: you also fund important research, support data privacy,...
About Clue
Scientific research at Clue
When you track in Clue, you contribute to an unprecedented data set that is forwarding the understanding of female health.
About Clue
Data is power, and responsibility: what we believe as Clue’s Co-CEOs
The recent overturning of Roe vs Wade has not only changed the landscape of reproductive rights in the US, it...
by Audrey Tsang, and Carrie Walter
About Clue
The journey of a single data point, Part II: Your data is not the product at Clue
We never have and we never will.
by Ida Tin
About Clue
Clue's response to Roe vs Wade
While we navigate this new reality, we promise to squarely face the challenges it brings, to listen and do everything...
About Clue
The journey of a single data point
It's our job to keep everything you track in Clue safe.
by Ida Tin
About Clue
Patient Data Privacy at Clue: A statement from the Co-CEOs
We do not sell your health data, we protect it and we will not disclose it
by Carrie Walter, and Audrey Tsang
