Welcome to the world’s leading period tracker*, backed by 120+ doctors and medical experts, recommended by OB-GYNs, and trusted by 420M+ women worldwide.
Whether you're tracking your menstrual cycle, trying to conceive (TTC), understanding PMS or PMDD, or navigating pregnancy or perimenopause, Flo is here for every life stage.
With Flo’s period tracker, you’ll get personalized insights, accurate menstrual cycle predictions, and a better understanding of your ovulation, fertility, pregnancy, and overall health. Join Flo’s growing community today.
Why Choose Flo?
Easy: It’s a period tracker, ovulation tracker for those trying to conceive, pregnancy tracker, mood tracker, and a guide for understanding symptoms of perimenopause to PCOS, endometriosis and fibroids all in one app.
• Trusted by 420M+ worldwide with over 10 million 5-star ratings.
• With Flo’s period diary, log symptoms daily to uncover cycle trends, learn what they might mean, and feel more prepared for doctor visits.
• Set birth control reminders.
• Use our ovulation tracker to better recognize your fertile signs. Combine it with BBT (basal body temperature) logging and expert TTC tips. The ovulation tracker is especially helpful for couples on a trying-to-conceive (TTC) journey.
• Check if symptoms match those common in PCOS, endometriosis, uterine fibroids, or perimenopause with our Symptom Checker tool.**
• Sync Flo’s period tracker with your smartwatch or wearable.
• Teens can use Flo’s period tracker to understand their first menstrual cycles and track symptoms in a safe space.
• Flo for Partners: Share Flo with your partner to get support during your menstrual cycle, make TTC a joint effort, or track your pregnancy journey week by week with our comprehensive pregnancy tracker.
• Track each trimester using Flo’s pregnancy tracker, which offers weekly updates, expert content, and baby development milestones. It’s more than just a calendar—it’s a full companion during your pregnancy.
• Stay on top of changes caused by hormone shifts, including potential irregular cycles, during perimenopause with dedicated tracking tools and expert guidance.
• Understanding PMS and PMDD and tracking your mood could help you notice menstrual cycle patterns and plan ahead.
• Keep a detailed period diary to understand if you have irregular cycles.
• Support your self-care goals with insights to guide daily habits like sleep or physical activity.
• Practice self-care with mental health tips. Reflect on your emotions and spot patterns with our mood tracker.
• Industry-leading privacy and security with dual ISO certification.
• Optional Anonymous Mode protects your identity — no one, not even Flo, can identify you through your health data.

Enjoy more features with Flo Premium:
• Personalized symptom patterns analysis.
• Symptom Checker for PCOS, perimenopause, endometriosis, and more.
• In-depth pregnancy tracker functionality for each milestone.
• Flo for Partners: Full menstrual cycle sharing designed for couples.
• 24/7 virtual Health Assistant.
• Expert-reviewed articles, videos, and courses.
• Information around birth control and fertility planning.
• Advanced ovulation tracker tools to help you understand fertility insights.

Please note: Flo is not a diagnostic tool and should not be used as a method of birth control or to facilitate conception. Predictions and insights provided by the app are intended for informational purposes only and are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for any health concerns or decisions.
Contact [email protected] for assistance with our period tracker and ovulation tracker.
Download Flo today and join the millions of women who trust Flo.
* Sensor Tower, March 2025, by downloads.
** Not available in the UK or EU.
Privacy: https://flo.health/privacy-policy
EULA: https://flo.health/terms-of-service