Flo is a science-backed period tracker, ovulation tracker, fertility, and pregnancy app used by over 500 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 500 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 recognised 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 personalised 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 organisation 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, personalised insights
What do I get with Flo Premium?
Unlock deeper, personalised insights and advanced tracking tools with Flo Premium.
- Daily, personalised insights
- Expert-led video courses on fertility, pregnancy, and birth
- In-depth pregnancy features for every milestone and baby stage
- 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, July 2026
Privacy Policy: https://flo.health/privacy-policy
Terms of Use: https://flo.health/terms-of-service
I’ve been using the app for seven or eight years now. I love it for its clear and intuitive functionality. I use it all the time, and it really helps me answer my gynecologist’s questions with confidence during appointments. Plus, over the past year with the premium subscription, I’ve been able to understand how my mood and physical state shift throughout my cycle. The cycle forecast feature in premium is absolutely brilliant. Thank you so much!
Developer Response
Hello Matosha, We appreciate your support and are delighted you find it helpful! Your insights matter greatly, and we're here to assist you further if needed. Tuyos, Flo
Constant bugging.
Goda_.
I’ve used this app for as long as I can remember, probably around 8-9 years. And the main problem that continues is constant bugging and lagging. I always have to close the app and reopen it to continue putting my information. I can’t even open a calendar to see dates without lagging. I thought that maybe it was my phone’s problem, but it continued as I changed phones to newer models. Please do something about it. Second problem is pop ups. I understand the need to promote your bussines and everything is alright with it. But pop ups plus constant lagging makes this app super anoying. Sometimes I can’t do anything in this app because it lags on a pop up. I would change apps but sadly, this app has many years of my period information and I don’t want to lose it. I still have hope you fix this.
Developer Response
Hi there! We're very sorry to hear that you can’t use Flo at the moment. Please contact us at support@flo.health. Be sure to specify your request, your device, and the amount of free space on it. We'll be happy to assist. Best regards, Flo Team
Too much pop-ups.
kk_rev
Good app, using it about 4 or more years, everything was good, but then devs decided to add millions of features and pop-ups that you can’t just turn off. This became annoying and uncomfortable as hell. it would be good to have a choice of the list what you want to use in the app / or simple version for those who just want to control periods without “don’t you wanna read about all the joy of your periods?” -No, God, no. For annoying ads I would give 1star, but devs and designers worked too much and hard to make them happen so I have to appreciate the job. Same time, with these ads I want to throw my phone in the river screaming like a seagull how much I hate the updates, so please, guys, do something with it😀
Developer Response
Hello there! We’re sorry if you found our promotion of Flo Premium a bit pushy! We’ve been working hard to develop our product so that it’s helpful on your journey to becoming healthier every day. While we would be pleased to have you try Flo Premium, we value all of our users, whether they subscribe or decide to use the free version. Flo Team
everything changed to worse
gabi1248402
I have been using this app for about 5 years, and it was amazing, I was talking with everyone about it. I was reading forums, I always checked the chances of getting pregnant, symptoms and so on. Now I can’t do any of that, because I don’t have premium account. at this point the app is useless ( if you are not willing to spend money). If you are thinking of downloading it because its free, don’t since its almost not. If it didn’t have the data about my period dates I would just delete it and download another one. Not only that its practically useless-the non stop pop ups about premium account are so annoying too.. I really used to love it, but I guess nothing is free anymore..
Developer Response
Hi gabi1248402!Thank you for sharing this. We’re sorry to hear you’re disappointed that we moved some features out of the free plan. Premium subscriptions fund the ongoing development of the app, while keeping the basics free for everyone. We welcome your feedback. Please email us at support@flo.health.Kind Regards,Flo 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 10.6.1
Subscriptions
Flo: Cycle Tracker
Connect your life & your period with Premium
Free Trial
Flo Pregnancy Tracker
Flo Pregnancy Tracker
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
3,99 €
Ovulation Tracker
Understand your fertile days
9,99 €
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 based, for example, 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
