Discover the most popular female health & well-being guide chosen by 140M women, co-created with 80+ leading health & medical experts, and acclaimed medical institutions.

• Partner of the United Nations Population Fund in the area of reproductive health
• 80+ doctors and health experts are part of the Flo Medical Board
• Thousands of women log pregnancies every day on Flo
• App of the Day in the AppStore in over 30 countries
• Best Fertility App 2020, Healthline

No matter your life stage or reproductive goal, personalize Flo to make it unique and relevant for you. Based on advanced AI technology Flo helps you to monitor your cycle, fertility, or pregnancy accurately. As a one-stop solution for all things female health and well-being, you can track all-in-one: period start date and length, fertile window, PMS symptoms, flow intensity, birth control, water intake, sleep and step counter, and much more.
Detect your peak ovulation days, monitor discharge, record ovulation tests, and BBT for when you are trying to conceive. Follow your baby’s growth weekly during pregnancy.

Your cycle is so much more than your period. Every woman is unique and experiences various symptoms, mood swings, and energy levels each cycle phase. Together with a team of 80+ health experts, Flo helps you to understand your body better. Explore accurate cycle predictions and tips on how to benefit from your cycle phase and hormone levels for clearer skin, better workouts, and more energy.

Discover a personal journey to motherhood with Flo. Get pregnant as soon as naturally possible for you by identifying your most fertile days, and receiving tailored insights. Flo’s pregnancy mode gives you access to beautiful images to follow your baby’s growth weekly. Calculate your due date, set a countdown, and learn the essentials of newborn care.

Log 70+ symptoms and activities to get the most precise AI-based overview of your body’s patterns. Keep a diary of your weight, water intake, physical activity, sex drive, moods, and PMS symptoms to monitor changes and receive accurate predictions. Get access to an entire health & well-being multimedia content library with articles, videos and surveys co-created with 80+ experts.

Schedule reminders of your period approaching, start and end date, your ovulation day, and personalize Flo to get notifications about weight, sleep, water intake, step goal, and birth control.

Get access to your monthly health report with personalized cycle graphs, and indications of your body’s patterns. A virtual health dialog will provide proactive information based on your unique profile and symptoms.

Safely discuss intimate topics, ask questions anonymously and get support from one of the largest female communities worldwide.

Flo offers a subscription plan that gives you a more personalized experience and unlimited access to the entire health & well-being multimedia content library

• Payment will be charged to iTunes Account at confirmation of purchase
• Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
• Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
• Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
• Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable

For more information please visit the link
Privacy Policy:
Terms of Use:

Download this period diary and join millions of women who trust their cycles to Flo

What’s New

Version 5.3

Discover new courses, additional health dialogs, and “Her Body, Her Story” — a podcast from Flo.

Take your health and well-being to the next level with the app used by 140 million women.
With Flo 5.0 (and every version after), you’ll get access to smarter, more accurate predictions, a daily well-being plan tailored to your needs, and new health content co-created with 80+ leading experts.

In this update, you’ll get exclusive access to our new podcast, “Her Body, Her Story.” Listen to true stories from Flo users and find out how they have overcome their health & well-being challenges to live happier, more fulfilling lives and get tips from the experts on how living in sync with your cycle can improve your well-being.

Mental health matters too. The Flo Health Assistant is there to help you understand which of the negative moods you log may be linked to a specific condition, such as depressive and anxiety disorders, stress-related conditions, or other physical conditions that may lead to emotional symptoms.

Explore new courses for TTC and Pregnancy modes. Using Flo to conceive? Have a look at our new course, “The Ultimate Baby Budget Guide.” Using Flo during your pregnancy? Discover new beautiful, interactive images to see how your baby is growing. We’ve also launched a new course, “Pregnancy Hormones” — check it out.

We cover everything you need to know about your cycle, always putting your health and well-being first.

The Flo Team
P.S. If you like Flo, please consider rating the app and leaving a review. Ratings and reviews help us help more women.

Ratings and Reviews

4.8 out of 5
657.5K Ratings

657.5K Ratings

Ricecake2003 ,

love it!

this app is super useful for tracking periods, and has given me mostly accurate predictions so far! it’s been off by a day or two a couple times when i first started using it because it wasn’t adjusted to my cycle yet, but since then i haven’t had any issues. i love the insights where it gives info about my period and the different changes that come along with a period, and i especially love that you can comment anonymously on posts and get help from and give help to the community. by far, my favorite thing about the Flo app is that you can have it give you reminders to drink water, take meds, and weigh yourself if that is something that you’re concerned about! the reminders are super helpful for me as my meds are for adhd, so i need a reminder so i actually remember to take them lol! the only thing that i would adjust is that my water bottle has metric markings, but i live in america, so i have to convert the metric to ounces to track my water because the only way to use metric for water is to switch the entire app over to metric. this isn’t a huge deal because google is a pretty good converter but it’s just something that i’ve noticed. overall, this is a great app and i’ve recommended it to friends and family, and now i’m recommending it to you!

Developer Response ,

Hi there!
Thank you for using Flo and reaching out!
You can disable the metric system mode, if you follow these steps: More > Settings > Unable metric system.
Hope it helps!
Kind regards,

Naughty nixon ,

It’s nice but...

So I used this app for my period And it was great up until my period change and I came on a week early which was perfect for my weekend away because we were planning to get pregnant and my ovulation date was set for a specific day. Well I was on my period a day or two longer so I figured it would probably change my ovulation date. Well my trip was set to be at least about 2 to 3 weeks away and I kept checking the app to make sure and to see if my ovulation date was going to change well it didn’t change it stay the same and make sure that I refresh my app just in case and it stayed the same. Now the day I get to my destinations for my trip is my ovulation day that was on the app that’s what we were depending on. Three days later I go on the app to mark the fact that we made love and the ovulation date changed to the day before I arrived on my trip. Immediately I was upset because it seems as though we may have missed the ovulation day due to the fact that the app didn’t update until after my ovulation date that was set originally. So I deleted the app because of that. It’s very upsetting when you’re trying to get pregnant and your ovulation date just seems to change along with your fertile days changes I just think that that is something that they need to look into I no longer want to use this app.

Developer Response ,

Hi there! Thank you for your feedback. Could you please contact us directly from the app (More-Contact support), describing your problem and without deleting any symbols from the message so that we could help you.
Best regards, Svetlana.

kathynicole ,

Extra features only available with premium

I originally downloaded this app to track my period and my symptoms. I do still like it for that, but I also really loved when more features were added such as giving helpful bits of info about the whole cycle. This info wasn’t always that helpful for me because most of it I knew already, but I do think it’s helpful for younger people. I didn’t learn much about the menstruation cycle in school, and I just can’t imagine much has changed. It was also helpful that they gave you tips seemingly based on the symptoms you plugged in. However today I went to log my symptoms and noticed they added in stories on why we get cramps, etc., but they are all only available to premium users. And when I went to the screen that used to have helpful articles, mostly all of the information is locked for premium users. This is all information that should be provided for free. Now kids are still going to have to wade through inaccurate information on the internet because apps like this are charging for the most basic information. I understand that you need money to survive, but information menstruation shouldn’t only be available to people with money. Also you would think they could get a moderator for the chat rooms or a professional to help answer questions, but no. So the chat rooms and answers are inaccurate and overrun with teens who don’t know anything because apparently female anatomy is only available to people with money. It’s such a shame.

Developer Response ,

Hi kathynicole,

Thank you for reaching out. We really appreciate your feedback on version 5.0 of Flo.

In this version we updated our algorithms to make Flo’s predictions even more accurate and useful, as well as added in the ability for all Flo users to further personalize the app. We also moved some features from the free plan to the premium plan, which is why you may have seen popups asking you to subscribe to our premium plan to access certain types of content. Even with this change, the core features of our app (cycle tracking and prediction) remain free for everyone.
We believe cycle tracking should be available to everyone who needs it, regardless of ability to pay. For users who are interested in our more advanced options, the funds we receive from our premium subscribers enable the ongoing development of the app, and help keep the basics free for everyone.

Flo is supported by a subscription-based business model. With a subscription model none of our users see annoying ads, and your data is safe and secure – regardless of whether or not you’re a subscriber. Just to give you a glimpse of the team that is working on Flo: we now have a team of over 200 passionate, dedicated employees, and over 60 medical and health experts from medical schools and hospitals – OBGYNs, Endocrinologists, Psychologists, Dermatologists, Dietitians, and more, who make sure all the content in the app is evidence-based and trustworthy. Our product managers and engineers work each day on the functionality of the App, tailoring it to your needs, goals, and symptoms. Every day our tech team works hard, implementing industry best practices and standards in data security, to keep your data safe and secure. These are just some of the costs to create a product that helps you on your journey to becoming your true best self, healthier and happier, every day.

We encourage you to check out the premium version. Each day you’ll find personalized tips on wellness for that specific day, based on where you are in your cycle. Plus you can find tons of helpful information in our new Discovery section, a rich, robust, and easy-to-navigate library of multimedia health and wellness content that has replaced Health Insights.

Here at Flo we have big plans for how to keep improving our app to make it even more accurate, relevant, supportive, and fun for you. We are happy that you’re a Flo user, and we will be grateful if you choose to become a premium subscriber and support the work that we do. Of course, you’re welcome to use the free version as long as you’d like.
Please continue sharing your suggestions with us, and feel free to reach out at with any questions you have. Your feedback is truly valuable, and it helps us do a better job of improving the app for you.

Kind Regards,
Flo Support Team


Flo Pregnancy Assistant
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Flo Wellness & Period Tracker
Put your health first with Flo Premium
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Flo Ovulation & Health tracker
Get personalized insights & Plan pregnancy


196.3 MB

Requires iOS 11.0 and watchOS 2.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Danish, Finnish, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese

Age Rating
Infrequent/Mild Medical/Treatment Information
In-App Purchases
  1. Flo Pregnancy Assistant $49.99
  2. Flo Premium $9.99
  3. Flo Premium $19.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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