Flo achieves ISO 27001 certification becoming first period & ovulation tracker to meet world-class security standards. Read more

4.8 in App Store
4.6 in Google Play

The #1 period and ovulation tracker worldwide

Over 250 million people around the globe use Flo as their ovulation and period tracker app, fertility calendar, and pregnancy assistant.

Period tracking app

Understand your cycle and feel your best

If you want to know more about your body and how your cycle can affect everything from your mood to your energy levels, tracking your periods and ovulation is a great place to start.

Tracking cycle in Flo

Increase your chances of getting pregnant

By tracking your cycle and body signals, Flo helps you work out when you’re most likely to get pregnant.

Getting pregnant with Flo

Stay healthy in pregnancy

From week-by-week growth tracking to appointment reminders, you will get all the support and information you need for your body and your baby with Flo’s pregnancy mode.

Pregnancy mode in Flo

Why are millions of women using Flo?

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Accurate predictions

Tracking your periods and ovulation with Flo can help you calculate and predict symptoms ahead of time, getting you prepared for the days ahead.

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Medical credibility

Our team of 100+ doctors and health experts create evidence-based medical articles, tips and recommendations designed to improve your health.

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With Flo, you’re in control. You trust us with your personal information, so we’re open about how we keep you safe. And we’ll never share your health data with any company but Flo.

What people say about Flo


The best period tracker app. This app is awesome, you don't get unnecessary contents, there's a separate page for topics that you want to know or discuss about. It's so easy to use.


Very useful app. Predictions are accurate too. Provides good guidance and education on female reproductive health. Helped me track my periods until I got pregnant. Very good app.


Best menstrual cycle tracker. Plus I upgraded to premium and the features are great. More like an all around health app. Nutrition plans, sleep courses, daily health care advice from doctors for women.

4.8 in App Store
4.6 in Google Play
Download the app

Know your body. Own your health.


Use your phone's camera to scan and download Flo app.
Available on iOS and Android devices.