✧ A little clarity, a lot of hope

Find your best days to conceive

Just your age and when your period usually comes. No name. No sign-up. Free.

♧ Private by design♡ Gentle guidance

❀ Your little starting pointStep 1 of 2

First, a little about you

How old are you?

We only use your age for general fertility guidance.

Your age (18–55)

No birth date needed. Your age isn't saved.

🔒 100% anonymous — no name, no sign-up. Nothing is saved; everything is calculated on your device.

❀ Simple by nature

How Babywindow works

Three gentle steps, with your privacy always in mind.

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Step 1

Enter your age

Just your age in years. No birthday or personal details.

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Step 2

Pick a day or week

Tell us roughly when your period usually starts.

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Step 3

See your best days

Get your estimated fertile days on a simple calendar.

The science, simply: Ovulation often happens about 14 days before the next period. Sperm can survive up to 5 days and an egg for about 12–24 hours. That's why the estimated fertile window includes the five days before ovulation and the day of ovulation. Real cycles vary, so these are estimates.

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