Period Tracker App: Luna Flow

Period tracker app that keeps your data private. Luna Flow is a simple period tracker, period calendar and cycle tracker: log your period, symptoms and mood in seconds, see when your next period is due, and understand your menstrual cycle better every month. No account and no cloud: everything you log stays on your phone.

PERIOD TRACKER WITH PREDICTIONS
• Log your period in two taps: start date and flow
• Period predictions that learn from your own cycle history
• A cycle ring that shows your cycle day, phase and next period at a glance
• Late-period awareness and your next six predicted periods
• Add or edit past periods any time for better predictions

PERIOD CALENDAR AND CYCLE TRACKER
• Month calendar with logged periods, predicted periods and your estimated fertile window
• Tap any day to see or change what you logged
• Track irregular periods: predictions adapt as your cycle changes

SYMPTOM, MOOD AND PMS TRACKER
• Flow, 16 symptoms including cramps, headache and bloating, 12 moods, energy, discharge, sleep, water, temperature and weight
• A quick 10-second check-in from the Today screen
• Voice notes: speak, review the text, then save (uses your phone's speech-to-text)
• A private journal tagged with your cycle phase

CYCLE INSIGHTS
• Average cycle and period length, shortest and longest cycle, and regularity
• Symptom patterns: which symptoms show up in which phase
• Mood and energy across your cycle
• Charts for basal body temperature (BBT), weight, sleep and water

OVULATION TRACKER AND FERTILE WINDOW (ESTIMATES)
• Estimated ovulation day and fertile window on the calendar
• BBT chart and discharge tracking to help you understand your cycle
• Clear, honest notes on what calendar estimates can and can't tell you

PILL REMINDER AND PERIOD REMINDERS
• Daily birth control pill reminder with a pack view (21+7, 24+4 or continuous)
• Reminders before your period is due, when your fertile window starts, and a daily check-in

LEARN AND FEEL BETTER
• A guide to your four cycle phases: body, mind, food and movement
• Short reads on cramps, PMS, heavy periods, BBT, sleep and more, with new articles added regularly
• A guided breathing exercise, self-care ideas, and food and workout ideas for each phase

A PRIVATE PERIOD TRACKER APP, BY DESIGN
• No account, no sign-up, no analytics
• Your data is stored only on your phone and excluded from cloud backup
• PIN app lock
• A backup file you control, to keep a copy or move to a new phone
• A PDF report to share with your doctor, only when you choose
• Share upcoming dates with a partner by message, only when you choose

Luna Flow is a free period tracker app supported by ads. Nothing you log is ever shared with advertisers, and you can go ad-free for 24 hours by watching one short video.

Light and dark themes, °C or °F, kg or lb.

Luna Flow gives estimates based on what you log. It is not a medical device and must not be used as contraception. Always talk to a clinician about your health.

Recent changes:
1.0.0