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
- 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
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
**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
I used to love flo. I’ve been using the app since my junior year of high school (I’m now a senior in college). I appreciate how I’ve been able to track my period through the years, as it’s been enormously helpful to my overall health, well-being, and awareness of my body. That being said, I have really struggled with the new updates that flo has undergone. Not only has the app become significantly less user-friendly, but the constant push to “go premium” has really negatively impacted my experience. I understand why they have a premium option, and I respect that it is there, but what I don’t respect is how I’m constantly being mislead in order to be trapped into signing up for a premium subscription. I find it really irresponsible that women who don’t want to pay for this app, will be given insights about their menstrual health, only to find out that they can’t have access to the information behave they don’t have an account! I used the chat feature a few times before, and it’ll leave me responding to chats for about 5 minutes, and right before they give me an answer about my health, they say I need to subscribe! It’s honestly cruel that an app meant to help women feel more secure about their health, is constantly misleading them like this, or trying to buy their desire for basic health info! Most of which can be googled, btw. I’ve really loved using flo, but am honestly considering shifting gears if things don’t change soon.
Developer Response
Hi mallalalalalalalalala,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 Support Team
Above just a period app
Amanda_bubble
I used this app for a couple years to track my period and symptoms every month. (Like most). And I found it very useful to see symptoms that I would get routinely every month, especially since I wasn’t always exactly on schedule. At the time I always had my period every month and from my knowledge I thought it was normal the cycle lengths I had. But after two years Flo popped up with a notification letting me know “Your symptoms match up with people who have PCOS and thought was aren’t drs. We think you should ask or bring it up to your OBGYN.” My phone died right after and when I would try to look it up later I constantly ran in to pms. Acouple years pass and I out of the blood skip my period for three months with no pregnancy but period pains with no blood. I call my obgyn and they tell me. “We think you have pcos, we are gonna do blood work to make sure but we are pretty certain” blood work came back and I was diagnosed with polycystic ovary syndrome. Which was a relief and yet scary all at the same time. But it made me think back to when the Flo app sent me that message years prior, telling me to chat with my dr. I really appreciate this app and the developers for recognizing that pcos is a thing and people can go through life not every knowing or being diagnosed. So I told my dr about how my period tracker on my phone recommended I chat with them about it. So if you had any thoughts on why this app is so useful and above the rest. This is why it meant so much to me!
Developer Response
Hi Amanda!We really appreciate your feedback! We’re so glad that you like using our app! 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
Deleting the App
genuine_feedback!
Gave a 5 star so this will be seen.I have been using this app for well over 5 years, it used to be so great and user friendly. And I really appreciated being able to track my cycle and have insight as to what I was going through, all the way up to when I got pregnant early last year with my daughter. & then the app didn’t really have much to offer compared to other apps as far as tracking my pregnancy. I redownloaded the app once I started having periods again postpartum and every so many minutes within using the app, it prompts me to purchase the full subscription to be able to use even basic features that used to be available to everyone without purchase. In addition, when it prompts you to make a purchase, it literally forces you to agree and continue into the purchase by not allowing an exit button or anything to back out of the ad until you’re having to deny the purchase when it tries to ask for a payment method. It’s ridiculous that they are so money hungry that they now feel the need to try to force you into a purchase. It will also offer insight on your cycle but then pop up with an ad that you need to make a purchase to even see the insight. Other than being able to enter when you have your period and look back on the calendar, it is now a pointless app, I can literally use the calendar on my phone to do the same thing.
Developer Response
Hi 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. We’re very sorry for your experience. Could you please contact us at support@flo.health and let us know what you would like to change? Our team will be happy to assist you! Kind Regards, Flo Team
It’s helped me so much
Jessiewad
I love this app. I’ve had it ever since I’ve started my period, and it’s amazing. It’s accurate and even tho sometimes I’m a little late or early I don’t mind it because it gives me a general time and I’m not guessing like my other peers. I also could be getting more accurate if I logged in my symptoms everyday, something that IVE SEEN make it extremely accurate. Flo gives you articles after you’ve logged symptoms as well to try and help you, something I adore. These articles have been great to explore and for me to see what’s going on with my body. Flo’s community is amazing too!! All the girls are extremely respectful and helpful and is only trying to make another person feel more comfortable. They have a community part where you can anonymously chat with other girls, and you get notifications on the app when someone replies, something that’s an added feature, and I love it. Something else, that’s an amazing part of Flo, is that they have a lock on the app too, if you choose. A lot of friends like to go on my phone, and I would rather not let them see my period tracker. Flo sends reminders when your period is on your way too! And if you have a certain goal like getting pregnant, Flo with gladly help. (Something I haven’t explored quite yet based on my age.) There are indeed small cons, like some of the articles you have to get Flo Premium, and all the courses, you just pay, but those are only optional things, and I’m just fine without them. So, if you’re wondering, get Flo!
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 9.102.0
Subscriptions
Flo Menstrual Cycle Tracker
Your personal period calendar & symptom diary
Free Trial
Flo Pregnancy Tracker
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
Free Trial
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, 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.
