Ovulation prediction demo

Add one cycle fact and see when the next ovulation window is likely to happen.

Prediction calendar

PREDICTION Add a cycle event to see the next ovulation window. After calculation, this block will show the ovulation range and prediction confidence.
🥚 Ovulation: — 🌱 Fertile window: — 🔵 Follicular phase: — 🌙 Luteal phase: — ⚡ Pre-period days: — 🩸 Period: —

What demo mode gives you

DEMO Demo mode lets you check a prediction from one cycle event, without saving history. For multiple events and saved history, use an account.

Change the settings and see how the ovulation window moves. Multiple events require an account.

Cycle event

Cycle settings

How this changes the prediction

These settings help the prediction stay closer to the real cycle.

If you do not know exact values yet, the app still gives you a useful window and sharpens it with new events.

28
1845
Usually the number of days from the first day of one period to the first day of the next one.
5
210
How many days the period usually lasts.
4
110
How many days before the period this pre-period stretch usually begins.
14
917
The phase after ovulation and before the period. For many people it sits close to 14 days.
If the cycle shifts often, the prediction uses a wider date range.
Age helps estimate how wide phase variation may realistically be.
Enter the last three cycle lengths separated by commas: 27, 29, 28.

What the prediction shows

Add a cycle event and the prediction will show up here.