About this app
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.
Latest release
What’s New
• Share your fertile window with your partner as a card — you choose what goes in, and the card is built on your phone • New on Home: “Your logs around now” — what you noted at this point in past cycles • Luna’s illustration now changes with your cycle phase and how you feel • A tidier Home, plus a line showing what you logged today • Added German, French, Italian, Portuguese and Dutch
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Sep 11, 2026 · 10:03 PM Free