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
This app is excellent for first time young adults right up to menopause for tracking your periods, ovulation and monthly symptoms and pregnancy. It is intuitive and changes with the more information you give it tho u may not notice at first. I only have the free version which is more than enough for me and well thought of to not add pressure to buy any extras so it still gives you the critical needs of the app all for free. I urge all women to download and enter this app daily and watch as your body tells you subtle signs of what’s to come. Thank you for this well made easy to use app! For years now It’s Helped me track my period and then ovulation and now pregnancy. The added private chat subjects weekly opening up the ease of conversations women just should have and all private so no stress discussing anything. And best of all... it works perfectly fine for free for critical information so your not held at ransom at all. Highly recommend for young women new to the world of their body and periods or those trying to conceive for tracking body symptoms that you may otherwise miss. Very detailed daily multiple choice entries of symptoms to help the app predict what your cycle is doing. So easy to use and links with health app for added benefits and info all in one place. The best app I have on my phone.
Developer Response
Hello Crewman83,Thank you for sharing your positive experience! We really appreciate your detailed 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
Love this but pls take note
Catadorer
I love this app and it is very helpful although it does have some features that I don’t like or would like to improve. Please can you add more options in the daily log, like different feelings, types of medication/vitamins, more types of exercise, any unusual bodily functions, things you ate today, how your skin/hair is etc would be amazing!!!! Also can you please bring back the chat room things where we talk about subjects and offer advice? I loved those and I know that so many other girls did too. Or even can you make a general chat room for girls to talk about anything? That is a request I’ve seen a number of times and I know that Flo users would adore that feature. I definitely support the whole don’t be afraid to talk about your period thing and the videos with famous women about periods are awesome but I reckon the Flo users liked it better when you just had the daily advice and chat rooms. Love the advice too! But can you broaden your advice page to how to deal with relationships and stuff?Thank you so much!!!! I love Flo so much and I only want to see it improve so if you can improve any of these things above that would be amazing! xx
Developer Response
Hi Catadorer!Thank you for your idea! Unfortunately, there is no such option at the moment, but we are constantly working on improving our app. Our team will definitely review your suggestion to determine if it's possible to implement and how to make Flo more useful to our users.Best Regards,Flo Support Team
Not a trust worthy company
Lorlor1321
I’ve been using the same tracker for years and saw an ad for this one and thought it might be time to try something new. I signed up for a free trial and paid with Apple Pay. I wasn’t finding it that much better than my old one and didn’t really care for all the little insights. I couldn’t remember the price after the trial and went to check. It does not appear under subscriptions in Apple so if I had just checked there I might not have even realized I was subscribed and going to be charged but I was pretty sure I remembered signing up and that there would be a charge after the trial. I checked the app which does not let you manage your subscription. You have to go all the way to the web page and log in to cancel. The app has somehow retained my credit card info even though I paid through Apple Pay. I then canceled the free trial and thank goodness I was paying attention because even after I had canceled the trial and it confirmed the trial was canceled it still said it was set to bill me $124 for a year the date the free trial was to end and I had to cancel that also. Even now that I have “cancelled” the trial and cancelled the subscription for a year that I would have been charged after it still won’t let me delete my credit card info because my account is still “active”. Absolutely trash company that is making money through deception not value.
Developer Response
Hi Lorlor1321! 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: Menu — Help — Chat icon in the Flo app. Best regards, Flo Period and Ovulation tracker Support Team
READ THIS IF YOU WANT THIS APP
Jasmin /12/greatgame
Now i see that the only way for app creators to get money is to charge $$$. But i dont see why app creators just go to Apple and say can you make this app this much money. I see that its called marketing because i do that for the school i go to but i really just hate hate hate apps like that. It makes you answer all these questions so that artificial intelligence can help you with girl stuff, just so you can go through all that trouble to weigh and measure yourself and then out of nowhere it says ‘ monthly pay’ ‘ yearly pay’ ‘ 3 day trial’. This is everything youll ever want but i never got to experience it my self because my parents said they wont be spending any money on apps. And if you have a ‘ 3 day trial’ option just think that whoever if using it will want to use this app but some people can barely afford phones or technology or housing. I saw a homeless woman in her 30s with 2 kids on the street with a phone without a back on it, an iPhone charger all ripped up plugged into the charger point in the subway with a pack of pads and a tint bag of food. Just think about it. Im just trying to help. If you send back to me developers DONT because i dont like getting into fights at all! No hate towards anybody!!! 🙏🙏❤️❤️
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: Ovulation Tracker Premium
Connect your life & your period with Premium
Free Trial
Flo Pregnancy Calendar
Track your baby's growth with 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
$18.99
Ovulation Tracker
Understand your fertile days
$14.99
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.
