Estri Period & Cycle Tracker

Period Tracker, Ovulation & Fertility Calendar 🌸

Track your menstrual cycle with Estri — a private, AI-powered period tracker

and period calendar that predicts your next period, PMS, ovulation and fertile

days. Built for regular and irregular periods alike.

🩸 PERIOD TRACKER & PERIOD CALENDAR

• Accurate period predictions that adapt to your body, even with irregular cycles

• See menstruation, ovulation and fertile days on a clear, color-coded period calendar

• Log flow, cramps, moods, cravings, energy and sleep in your period diary

• Period reminders and PMS alerts, so you're never caught off guard

🌷 OVULATION TRACKER & FERTILITY CALCULATOR

• Predict your ovulation days and fertile window with precision

• Daily insights for your cycle phase — helpful if you're trying to conceive (TTC)

• Ovulation notifications at the right moment in your menstrual cycle

• Not planning a pregnancy? Understand your cycle phases with confidence

🤖 ESTRI — YOUR AI HEALTH COMPANION

Ask anything about your cycle, symptoms, moods or fertility. Estri's AI chat

knows your cycle day, remembers your patterns, and answers like a knowledgeable

best friend — anytime, judgment-free.

• Daily brief: hormones, mood, energy and body, personalized to your exact cycle day

• AI food scanner: snap a meal for instant, cycle-aware nutrition insights

• Cycle-synced meditations and gentle self-care nudges

🤰 PREGNANCY TRACKER & DUE DATE CALCULATOR

Expecting? Switch to pregnancy mode:

• Week-by-week pregnancy tracking with your baby's size and development

• Due date countdown, trimester timeline and pregnancy-safe nutrition tips

🫶 PARTNER CONNECT

Invite someone you trust to follow your cycle, symptoms and daily updates —

keep your support system close through every phase of the month.

🎁 Invite a friend and you both get 7 days of Premium free with your personal

referral code.

🔒 YOUR DATA STAYS YOURS

Your menstrual health is nobody's business but yours. Your data is protected,

never sold, and you can delete it anytime.

📄 DOCTOR-READY REPORTS

Export a clear PDF summary of your cycles and symptoms to share with your

gynecologist.

From your first period to pregnancy planning — Estri is the period tracker and

ovulation calendar that grows with you.

Note: Estri should not be used as contraception and does not replace

professional medical advice.