
LunaCat- Cycle, Ovulation, TTC
Period & Ovulation Tracker
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Free
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About
Never lose track of when your period's coming.
LunaCat predicts your next period and ovulation day, ahead of time.
■ Two taps, and you're done
Just tap once on the day your period starts.
- No complicated input, just the start date
- Your next cycle is calculated automatically from what you've logged
- Fix a past entry anytime, right from the calendar
■ See everything on one calendar
Days you had your period, your predicted period, predicted ovulation day, and fertile window are each shown with their own color and shape.
- Switch between month and year view
- Browse from 2025 through 2027
- Tap any date to see that day's log instantly
■ A home screen that adapts to your goal
Your home screen changes depending on whether you're trying to conceive or just tracking your cycle.
- Trying to conceive: your fertile window and predicted ovulation day take center stage
- Tracking your cycle: your next period date front and center
- Want to understand your body: articles matched to today's phase
■ Reminders, on your schedule
- Upcoming period alert
- Ovulation and fertile window alert
- Birth control pill reminder (set your own time)
- Daily logging reminder (set your own time)
■ Log how you're feeling
- Symptoms, mood, vaginal discharge, digestion, physical activity
- Sex and contraception
- Your cat's expression changes with the mood you log
■ Cycle analysis
- Average cycle length and period length
- See at a glance whether your cycle is regular (ACOG's 24-38 day standard)
- A month-by-month chart of your cycle
■ Things worth reading
- Understanding the 4 phases of your cycle
- Dealing with PMS
- Choosing period products that fit you
- Learning about birth control methods
- Signs that mean it's time to see a doctor
■ Keep it to yourself
- Lock the app with your fingerprint or face
- Block screenshots and screen recording
- Hide notification content (lock screen shows only "LunaCat")
Your data stays on this device only - no sign-up required.
LunaCat is not a medical device. Predictions are for reference only, and fertile-window predictions are not a form of contraception. Please consult a healthcare professional for medical decisions.
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What's New in LunaCat
1.1.0
September 6, 2026
• Cycle analysis now has its own tab Regularity, monthly charts, and your history in one place. • Three new articles Vaginal health / Yeast infections / About the IUD • Articles are now grouped by topic Understanding your cycle, body care, and health & safety — each with its own illustration. • A refreshed welcome experience • Fixed the welcome screen being cut off on smaller devices (iPhone SE and similar)
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