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
I’d recommend this app to any menstruating female. It is an app that has many helpful features such as mood trackers and of course a period diary. It always has the ability to send notifications along with anonymous chat and many useful insights. If you're looking for a period app with mood and symptoms and how heavy your period is and how it differs this is the best one on the market right now. (But tbh I think another feature like tracking your diet and more detailed visuals and smarter assistance when logging period symptoms dates and things like that, even though that may be highly ambitious. I think the mood tracker should mirror in app purchased apps daylio as that app is great for checking your mood but important features are not free of charge, so I think if flo would allow you to log your emotions and have features such as daylio would save me alot of money. Also if it could tell me if what I’m eating would have an affect of my period or pregnancy or whatever rather than just my water intake, maybe a what did you eat tab or something I don’t really know what I’m requesting for. Also automatic sleep tracker another request/suggestion from in app purchasable apps). Overall my opinion of the app is that it is great and very very useful.
Developer Response
Hello Honesty,Thank you for sharing your positive experience! We really appreciate your feedback. We’re constantly working on improving Flo and we hope that we can make it even more useful and interesting for you in the future.Kind regards,Flo Support Team
Great for tracking but feel they now take advantage of people
The reviewer467.
I’ve been using the Flo app for over 5 years. It’s brilliant for tracking your period and logging symptoms. It’s also quite accurate for calculating the next time you come on. I would recommend it to anyone wanting that. When I first downloaded the app I thought it was absolutely brilliant and a positive way forward for people wanting to know more on their health topics. However, over year years I’ve been using this app the other features have become what feels like a money scheme to target people wanting to find out more about their health . Originally, anyone who uses the app were able to freely access information pages and forums on health related topics. The content of these were brilliant and would bring peace of mind for things many would stress about. Then a year to two into using the app features became restricted making people pay for accessing some features. However, the usual articles and forums were still free to read/use. Jumping to now, where the Flo app has completely restricted all access and help to people and forces them to pay premium. It’s feeling like they have isolated members of this community. It now feels like they are tacking advantage of the fact people want to know and get help for health related topics. Where in the past they used to actively support their members. I understand having some features paid for as the app need funds. However, I feel they have gone completely over the top.
Be careful about payment
kinkykinzy
The app itself is fine. The payment is a joke. Having read other reviews I was careful to make sure I had selected the monthly payments, however I was still charged £43 in a lump sum. Make sure you go to your subscriptions and check the monthly payment. There is no need to charge for a year with an app like this. No one wants to payout a lump sum like that, it doesn’t give you the option to cancel it then if the app doesn’t meet your needs! Or maybe that’s the point, they aren’t confident in their app, so take full payment up front expecting people to cancel. Well...I won’t be renewing next year simply because of that.UPDATE: the developer has “helpfully” told me how to cancel this subscription...which I already know how to do and have done. This was not the issue I stated. The issue I have is that, despite selecting to pay monthly, I was charged for an entire year in a lump sum. I was warning people to double check their subscriptions once they finish the free trial, as it appears selecting the monthly payment option in the app does not work. I was explaining that it was a disappointment to discover this had happened as I feel cheated out of my money, as I now have no option to cancel if after a few cycles I find the app does not meet my needs. If the app does not meet my needs, I will now be out of pocket as I will have paid for months of use that I will not be using.
Developer Response
Hi,Thank you for using Flo and contacting us!To cancel the subscription please follow the steps below:1. Launch the Settings app.2. Tap iTunes & App Store.3. Tap on your Apple ID.4. Tap View Apple ID when the pop up window appears.5. Enter your Apple ID password or fingerprint ID when prompted.6. Tap Subscriptions.7. Tap the Subscription you want to cancel.8. Tap Cancel Subscription/Trial.9. Tap Confirm when prompted to confirm that you want to cancel your subscription.This must be done 24 hours before the end of a free trial or subscription period.Best regards, Alexandra
Bed experience
Hemit D
I have pcos problem and this app wasn’t helpful for me and The payment is a joke. Having read other reviews I was careful to make sure I had selected the monthly payments, however I was still charged £43 in a lump sum. Directly for premium membership Make sure you go to your subscriptions and check the monthly payment. There is no need to charge for a year with an app like this. No one wants to payout a lump sum like that, it doesn't give you the option to cancel it then if the app doesn't meet your needs! Or maybe that's the point, they aren't confident in their app, so take full payment up front expecting people to cancel.Well...I won't be renewing next year simply because of that.UPDATE: the developer has "helpfully" told me how to cancel this subscription...which I already know how to do and have done. This was not the issue I stated. The issue I have is that, despite selecting to pay monthly, I was charged for an entire year in a lump sum. I was warning people to double check their subscriptions once they finish the free trial, as it appears selecting the monthly payment option in the app does not work. I was explaining that it was a disappointment to discover this had happened as I feel cheated out of my money, as I now have no option to cancel if after a few cycles I find the app does not meet my needs. If the app does not meet my needs, I will now be out of pocket as I will have paid for months of use that I will not be using.
Developer Response
Hi Hemit D! Thanks for reaching out to us. Flo Premium is optional and provides access to all features of the app; however, the app’s main functions are available free of charge. Deleting the app does not cancel a subscription, unfortunately, as it is tied to your Apple ID. Because Apple protects all billing information, the only way to request a refund is to contact Apple directly. To request a refund: 1. Go to reportaproblem.apple.com. 2. Sign in with your Apple ID and password. 3. Tap or click “I’d like to.” 4. Choose “Request a refund.” 5. Choose the reason why you want a refund, then choose Next. 6. Choose Flo, then choose Submit. After that, you’ll receive an email from Apple with a decision. Let us know if you need additional guidance at support@flo.health or Menu — Help — Contact us in the Flo app. Best regards, Flo Period and Ovulation tracker 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 9.101.1
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
£6.99
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.
