Flo is a science-backed period tracker, ovulation tracker, fertility, and pregnancy app used by over 460 million* women worldwide.
Whether you’re tracking your period (regular or irregular), trying to conceive, following changes to your baby and your body during pregnancy, or navigating perimenopause symptoms, Flo is here to support you. Join 460 million users* who use Flo’s science-backed insights, created with 100+ doctors and medical experts, to better understand their menstrual cycle.
Is my data safe with Flo?
Your health data deserves the highest level of protection.
Flo was recognized as ISO 27001/ISMS Team of the Year at the 2025 PICCASO Privacy and Security Awards, honoring our excellence in information security management and long-standing commitment to privacy-first design.
- Anonymous Mode: Use the Flo period tracker without linking your name, email, or personal identifiers
- Dual ISO certification: Industry-leading security standards to keep your data safe
- Secret Chats: Connect with like-minded members who share tips and personal experiences
Why choose Flo for period and ovulation tracking?
Flo is more than a basic calendar — it’s a smart period tracker designed to help you notice patterns over time.
- Log 70+ symptoms and moods to receive more personalized menstrual cycle insights
- Support for irregular periods, pre-period symptoms, and cycle changes
- Clear summaries you can share with your doctor
- An accurate period tracker to help you plan ahead with confidence (Flo is not a method of birth control)
Can Flo support my Trying To Conceive (TTC) journey?
Flo offers educational features to support your journey to conceive and better understand fertility.
- Fertile window and ovulation predictions based on your logged period data
- BBT (basal body temperature) tracking
- Daily insights to help you prepare to conceive a baby
- Partner tools to support shared awareness
How does Flo support my pregnancy by week?
Once you conceive, switch to Flo for Pregnancy for useful checklists and structured, week-by-week guidance.
- Pregnancy tracking with weekly updates as your baby develops
- Visuals and diagrams to help explain pregnancy changes
- Symptom tracking, reminders, and organization tools
- Expert-reviewed content and community stories for peace of mind
Is Flo suitable for teens and first periods?
Flo provides a safe space for teens to track their first period with age-appropriate education, helping them navigate puberty confidently.
Can Flo help me manage perimenopause symptoms?
Track changes during perimenopause with tools designed for this life stage.
- Perimenopause Score to follow symptom changes month by month
- Track cycle-related changes in sleep, energy, mood, and well-being
- Clear, personalized insights
What do I get with Flo Premium?
Unlock deeper, personalized insights and advanced tracking tools with Flo Premium.
- Daily, personalized insights
- Expert-led video courses on fertility, pregnancy, and birth
- In-depth pregnancy features for every milestone and baby stage
- Symptom Checker** that provides educational information on PCOS, endometriosis, and fibroids symptoms
- Ovulation insights to support your TTC journey
- 24/7 virtual Health Assistant for educational support
- Flo for Partners: Share updates like menstrual cycle predictions or pregnancy progress, and always stay in control of what you share with your partner
Medical disclaimer
Flo does not provide medical advice, diagnosis, or treatment, and is not a method of birth control. Predictions are for informational purposes only. Always consult a qualified healthcare professional.
Download Flo today and join millions using a trusted period tracker, pregnancy app, and fertility companion.
*Total number of users who downloaded Flo, March 2026
**Symptom checker not available in the UK or EU
Privacy Policy: https://flo.health/privacy-policy
Terms of Use: https://flo.health/terms-of-service
It’s a great app, it lets you track your feelings, your weight, symptoms etc. Also, it’s quite accurate and it lets you log any day as your period if it does come unexpectedly. The only problem I have is when you add your age, you must be 13 or older to log your period. And it irritates me as I’m 11 and many girls my age and even younger get their period at such a young age. Anyways, overall this app is great for tracking your periods and cycle. Goodbye now.
Developer Response
Hi there, According to our policy we're not allowed to collect personal data of people who are less than 13 years old. Kind regards, Valerie
Sharing data with Facebook
Dave82at
Flo shared private data with Facebook. Not the way to go.
Developer Response
Hi Dave82at! The past privacy investigation was based on inaccurate representations. Flo has never shared any user information with any third parties for commercial purposes. More information can be found here: https://flo.health/press-center/flo-response-ftc-settlement-updateYours,Flo
...
chennelx
It use to be a great app...until they updated it and you have to literally pay for everything. It’s very pricey as well. Imagine being young and just wanting to get some insight on your body, and people are trying to make profit off of that...that’s shady. I honestly do not recommend this app.
Developer Response
Hi chennelx,Thank you for reaching out. We really appreciate your feedback on version 5.0 of Flo.With the update, we’ve moved some features from the free plan to the premium plan, so some of the content that you may have seen on the free plan is now available only to our premium subscribers. The core features of our app (cycle tracking and prediction) remain free for everyone.Additionally, with Flo Premium none of our users receives irrelevant ads, and your data is safe and secure – regardless of whether or not you’re a subscriber.Just to give you a glimpse of the team that is working on Flo app. Flo now has over 80 medical and health experts from medical schools and universities – OBGYNs, Endocrinologists, Psychologists, Dermatologists, Dietitians, and more. They make sure all the content in the app is evidence-based and trustworthy. Our product managers and engineers work day after day on the functionality of the App, so that what you see in Flo is tailored to your needs, goals, and symptoms. Every day we work hard on implementing industry best practices and standards in data security. These are just some of the costs to create a product that helps you on your journey to becoming your true best self, healthier, and happier, every day.We encourage you to check out the premium version. Each day you’ll find personalized actionable tips based on your unique cycle phase and changes in hormone levels. In addition, you can find tons of helpful information in our new Insights section, a rich, robust, and searchable library of multimedia health and well-being content that has replaced Health Insights.Here at Flo we have a lot of plans on how we can take female health to an entirely new level and make our app even more useful and supportive for you. And we are glad to have you amongst our users.If you have any other questions, please reach out at support@flo.health. Your feedback is truly valuable, and it helps us improve the app for you and for many other women around the world.Kind Regards,Flo Support Team
Don’t bother unless you’re willing to pay
Chrystlin
Honestly Flo used to be good but now it’s garbage. You can’t access anything without paying for premium. Not even the “health insights” that used to be free. They went from being a great source of information and period tracking to being a money grab. You could say the whole community aspect makes up for it but that has way more to do with the users than the app. The app seems to want to start divisive conversations and often asks really outdated and sexist questions. Seriously thinking of deleting it.
Developer Response
Hi Chrystlin,Thank you for your thoughtful feedback! While we started as a period tracker 5 years ago we’ve expanded our mission to become a personalized health and wellbeing platform for women. We’ve started cooperating with over 60 top-notch medical and health professionals and together we’ve created completely new formats of content that are tailored to your needs, goals, and symptoms. Each day you can enjoy personalized interactive tips on wellness for that specific cycle day or search for tons of helpful and trustworthy health and wellness information in our Insights section. To sustain and develop a reliable app for hundreds of millions of women across the globe while keeping the tracking features free for all our users, we’ve made some changes in our business model. Those who are interested in our advanced features can subscribe to Flo Premium and support the ongoing development of the app. We hope you stay with us and try our rich content library and personalized daily plans.Kind Regards,Flo Support Team
Dear Flo Community,
This is a technical update that helps us improve our app and make performance even better.
Thank you for updating!
Always yours,
The Flo Team
P.S.: If you like our app, please don’t hesitate to rate and review us
Version 10.0.0
Subscriptions
Flo Menstrual Calendar
Your personal period calendar & symptom diary
Free Trial
Flo Pregnancy Calendar
Track your baby's growth with Flo Premium
Free Trial
Flo Birth Control Reminder
Set reminders for your birth control method
Free Trial
Flo Women's Health & Wellbeing
Trusted Information backed by health experts
$15.99
Ovulation Tracker
Understand your fertile days
$13.49
The developer, FLO HEALTH UK LIMITED, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Purchases
Location
Identifiers
Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
Health & Fitness
Purchases
Location
Contact Info
User Content
Search History
Identifiers
Usage Data
Sensitive Info
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
This app has an age rating of 13+ with content restrictions. Some content may be rated higher, but access is managed by the developer through in-app controls.
