Flo is a science-backed period tracker, ovulation tracker, fertility, and pregnancy app used by over 440 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 440 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
- Flo for Partners: Share updates like menstrual cycle predictions or pregnancy progress, and always stay in control of what you share with your partner
- 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
- Ovulation insights to support your TTC journey
- 24/7 virtual Health Assistant for educational support
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, December 2025
Privacy Policy: https://flo.health/privacy-policy
Terms of Use: https://flo.health/terms-of-service
A comprehensive app that you can trust to be accurate. Useful improvements make it better all the time. I would definitely recommend above other similar apps that I’ve tried.
Developer Response
Hi Greta,Thank you for your kind feedback! We’re really happy you like our app and we're constantly working on improving the app and hope that we can make it even more useful to you in the future.Kind regards,Flo Support Team
So many ads and toxic horny community
Kikipoldsamm
I used to like this app couple of years ago but for the last 2 years i cant even open the app, without closing around 5+ ads it opens. So annoying. I am not interested in 500+ articles behind the paywall and why does it remind me every day every time i open the app? It is so annoying. Makes me never want to purchase the premium again. I have chosen competitor due their instant and long term spamming with some useless AI chat they constantly force on me. I just wanna track my period, not talk to online chat or read articles what are the same the last 3 years. No new articles! Whomever is your UX designer, truly knows how to make an app what is anti-UX. so horrible! Their “community” is very one sided very horny women who insult everyone who arent liek them (constantly rubbing themselves off on some new furniture). A lot of their users spread factually incorrect health information and false information of sex life. I’ve stopped using this app. No control and the app owners allow false propaganda inside of their app. It has become a porn forum rather than helpful factual women’s health community. 99% of articles have sexual comments as if i have landed on pornhub forum.
Developer Response
Hi there! We’re sorry to hear that. We’d be grateful if you would write to us at support@flo.health and share how you suggest changing the functionality you refer to in your review. Thank you for your honest feedback! Kind regards, Flo Team
Sleep tracker and last updates
Katuwa_24
Last update was unexpected. The whole interface was changed and no words about it in update description. I like innovations and changes but I don’t like when some features disappear without any notifications. The most horrible lost for me was manual Sleep tracking disappearing. I was using the app every day only because of that option but now I just forget to fill symptoms etc since I don’t need to turn on/off the Sleep timer. Moreover, there is missing option to hide fields which I don’t need to fill, for example pregnant tests. If it is my aim, I will use it, but now it is just overwhelming the list of available adds. I really hope that you take it in consider and try to return features back. Thank you in advance! You make great job!
Developer Response
Hi there!Thank you for your feedback! Our team is already working on this problem, and we hope it will be fixed very soon. We truly appreciate your patience.Kind regards,Flo Team
Good app, bad notification system
NotSoCreativeName
The app in general is great for tracking your period, however it’s the secret chats notifications that bug me the most. While there is an option to turn the notifications on and off, there’s no option for you to not have notifications listed about a certain number of people replying to other people or posting in the same thread you commented on. I wish there was an option that only showed people liking or replying to your own comments instead of the app saying that “21 people also replied in:” or something.
Developer Response
Hi there! It’s feedback like yours that helps us to continue to improve our app - thank you! We will add your suggestion to the list of feature requests that are reviewed by our product team on an ongoing basis. Best 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 9.103.0
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
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.
