Where the prediction comes from
The app doesn't use a global average; it calculates from your own cycles. Which means every period you log brings next month's estimate closer to you.
What makes the most difference
-
1
The start day. The most important number; every other calculation depends on it.
-
2
The end day. It's what gives your period its length.
-
3
A few cycles of patience. With one or two cycles the estimate is rough; after three or four it comes close to your real pattern.
-
4
A missed month is fine. Add it whenever you remember. Symptoms aren't compulsory either — but they're what reveal your patterns later.
Sources
Health information, not medical advice, diagnosis or treatment. For your own symptoms, talk to a doctor.
Your cycle, honestly.
LadyOne keeps everything on your phone — tracking, predictions, and the day’s article. No account, and no servers of ours.