Log bleeding days
Tap to note when your period starts, changes, or ends.
Your Period tracker.
Understand your cycle
See where you are today, when your next period might start, and how regular your cycles have been. Log bleeding, check what’s coming up, and get simple answers about your cycle. All private, right on your phone.
What you can do
The basics for knowing your cycle, plus a little extra help along the way.
Bleeding predictions
Get a heads-up on when your next period is likely to show up.
Visual calendar
See your logged days and predictions across the month in one view.
Cycle visual
Follow along day by day so you always know where you are.
Clear cycle answers
Simple text for your phase, next period, and fertile window.
Insights and reminders
Friendly tips when they help, plus reminders you can set yourself.
Answers first. Charts if you want them.
Lua looks at your recent cycles (usually about the last six) to guess when your next period and fertile window might be. On the home screen, you get easy answers in plain words: your cycle phase, your next period date, and your fertile window.
You should not have to decode a chart just to know what’s going on. Text comes first. Charts are there if you like them.
Start with what Apple Health already knows
The first time you open Lua, it can pull in your cycle history from Apple Health so you are not starting from zero. When you log bleeding in Lua, that can also save back to Apple Health.
Later on, things like body temperature, resting heart rate, sleep, and workouts can help make predictions a little sharper. Right now the main focus is reading and writing period flow. More Apple Health support can grow from there.
Insights based on your real data
Lua figures out the numbers first. Then, if Apple Intelligence is on your phone, it can turn those numbers into short, friendly notes. It does not invent stories about your body.
Everyone still gets clear, ready-made messages for things like a longer gap between periods or unexpected bleeding. Apple Intelligence is not available on every iPhone, and it is not on Android. You still get helpful answers either way.
One app for your cycle, contraception, fertility and pregnancy.
Private, flexible and designed to adapt with you.
Frequently asked questions
The things people ask us most.
How do period predictions work in Lua?
Lua looks at your recent cycle history and estimates when your next period is likely to start, plus where you are in your cycle today. Predictions get steadier as you log more cycles. They are estimates based on your data, not a promise that your period will arrive on an exact day.
Can I import my history from Apple Health?
Yes, if you want to. You can connect Apple Health to import up to the last 12 months of period entries so you are not starting from zero. It stays off until you turn it on, and it only fills in days you have not already logged in Lua.
What gets shared with Apple Health if I connect it?
Only menstrual flow. Lua can read period entries from Health and save the periods you log back to Health. Your symptoms, notes, sex logs, contraception, and pregnancy data are never written to Apple Health.
Are fertile-window estimates a guarantee?
No. Fertile days and ovulation timing are estimates from your cycle history, shown as a window rather than a single guaranteed date. Timing can shift with stress, illness, travel, or for no clear reason at all. Lua is not a contraceptive and does not diagnose fertility issues.