Estri: Period Tracker & Cycle

Period Tracker, Ovulation Calendar & AI Cycle Insights

Estri is a period tracker and ovulation calendar that learns your cycle and predicts your next period, PMS, fertile window and ovulation day — then explains what your body is doing every single day. Private, ad-free, and built for regular and irregular periods alike.

Not sure when your period is coming? Estri tells you. Wondering why you feel tired, bloated or moody? Estri explains it. Trying to conceive or trying to avoid pregnancy? Estri shows your fertile days clearly.

PERIOD TRACKER & PERIOD CALENDAR
• Accurate period predictions that adapt to your cycle, including irregular periods and PCOS
• Color-coded period calendar for period days, fertile window and ovulation day
• Period diary: log flow, cramps, mood, energy, sleep, cravings and 40+ symptoms
• Period reminders, PMS alerts and late-period notifications
• Regularity score and average cycle length at a glance

OVULATION TRACKER & FERTILITY CALENDAR
• Ovulation calculator that predicts your 6-day fertile window and peak day
• Conceive Mode: see your chance of conceiving today and log ovulation tests in one tap
• Daily fertility insights for trying to conceive (TTC)
• Avoiding pregnancy? Know your cycle phases and plan with confidence

AI CYCLE INSIGHTS — ASK ESTRI ANYTHING
Estri is the AI period tracker that actually talks back. Ask about late periods, cramps, spotting, mood swings, discharge or fertility and get a cycle-aware answer in seconds, judgment-free, 24/7.
• Daily Body Brief: hormones, mood, energy and what to expect today, tuned to your exact cycle day
• Cycle Reports: an AI summary of every finished cycle you can share with your OB-GYN
• AI meal scanner: snap a meal and get cycle-synced nutrition tips
• Cycle-synced meditations, hydration reminders and self-care nudges

PREGNANCY TRACKER & DUE DATE CALCULATOR
Positive test? Switch to Pregnancy Mode in one tap.
• Week-by-week pregnancy tracker with your baby's size and development
• Due date countdown, trimester timeline and pregnancy-safe nutrition tips

PARTNER CONNECT
Invite a partner or someone you trust to follow your cycle, symptoms and daily updates so they know when to bring the heating pad and the chocolate.

YOUR DATA STAYS YOURS
Your reproductive health is nobody's business but yours. No ads, no selling data, encrypted sync, and you can delete everything anytime.

DOCTOR-READY REPORTS
Export a clean PDF summary of your cycles, symptoms and patterns to share with your gynecologist.

WHY WOMEN CHOOSE ESTRI
✓ Period tracker and ovulation tracker in one app
✓ AI that explains your cycle, not just a calendar
✓ Works for irregular periods, PCOS, endometriosis and perimenopause symptoms
✓ 100% ad-free, private and secure
✓ Invite a friend and you both get 7 days of Premium free

From your first period to pregnancy planning, Estri is the period tracker, cycle tracker and fertility calendar that grows with you. Download Estri and know your body better, starting today.

Estri is not a contraceptive and does not replace medical advice. Predictions are estimates based on the data you log.

Recent changes:
🛠 Bug fixes
• Fixed a crash on the home screen that some users hit while their Cycle Report was being prepared.
• Cycle Reports now ignore a period start logged within 14 days of the previous one, so a date slip or spotting no longer creates a false short cycle.
Thanks for tracking with Estri! 🌸