Flo is a science-backed cycle, ovulation, pregnancy, and period tracker with over 530 million downloads worldwide.*
Track your period (regular or irregular), predict ovulation, and learn to spot your fertile signs, follow changes to your baby and your body with a pregnancy tracker, and explore common perimenopause symptoms. Flo is here to support your whole menstrual cycle and female health journey.
🌍 Is my data safe with Flo?
Your health data deserves the highest level of protection.
Flo is the first and only period tracking app with dual ISO 27001 and ISO 27701 certifications, internationally recognized as the gold standard in data protection. In 2025, Flo was recognized as ISO 27001/Information Security Management System Team of the Year at the PICCASO Privacy and Security Awards, honoring our excellence and commitment to privacy-first design.
- Anonymous Mode: Use the Flo period tracker without linking your name, email, or personal identifiers.
- Secret Chats: Connect with 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 period tracker and ovulation tracker designed to help you notice patterns over time.
- Over 70 trackable 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
👶 Can Flo support my trying-to-conceive (TTC) journey?
Flo offers educational features to help you explore conception insights and better understand how to spot fertile signs.
- Fertile window and ovulation predictions based on your logged period data
- BBT (basal body temperature) tracking
🤰 How does Flo support my pregnancy week 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
- Expert-reviewed content and community stories for peace of mind
👩 Can Flo help me explore common perimenopause symptoms?
Track changes during perimenopause with tools designed to help you better understand this life stage.
- Perimenopause Score to follow symptom changes month by month
- Menopause Timeline to understand the phases of perimenopause
- Tracker to log cycle-related changes in sleep, energy, mood, and well-being
💚 Is Flo free?
Flo is free to download, with all the core tools you need to plan and understand your cycle.
📚 What do I get with Flo Premium?
- Daily, tailored insights and expert-led videos
- In-depth pregnancy features for every milestone and baby stage
- Symptom Checker** that provides educational information on polycystic ovary syndrome, endometriosis, and uterine fibroids symptoms
- Fertility insights to support your TTC journey
- 24/7 virtual Health Assistant for educational support
- Flo for Partners: Share updates like menstrual cycle predictions or pregnancy progress.
Medical disclaimer
Flo does not provide medical advice, diagnosis, or treatment, and is not a method of birth control or conception aid. Predictions and features are for informational and educational purposes only. Always consult a qualified health care professional.
Wear OS complications & tiles: Set up a tile and complication on your watch for insights about your cycle. Flo period tracker is compatible with Wear OS 3.
Download Flo today and join millions using a trusted period tracker, pregnancy app, and cycle tracker.
*Total number of users who downloaded Flo, March 2026
**Symptom Checker not available in the United Kingdom or the European Union
Privacy Policy: https://flo.health/privacy-policy
Terms of Use: https://flo.health/terms-of-service