Privacy Policy

Short version: the dates you enter never leave your device. We can’t lose, sell, or share your information because we don’t collect it.

What we collect

Nothing personal. There are no accounts, no sign-up, and no profiles. The dates and cycle lengths you type into a calculator are used only to compute a result in your browser, on your device, in that moment.

What leaves your device

Your inputs do not. Calculations are performed entirely in your browser using a local script. The dates you enter are never transmitted to a server, never written to local storage, and never placed in the page URL. Close or refresh the tab and they are gone.

Cookies and tracking

The calculators do not require cookies to work, and we do not use advertising cookies or third-party trackers to follow you across the web.

Analytics

If basic, privacy-respecting analytics are ever enabled, they are limited to anonymous, aggregate usage (for example, that a calculation occurred) and never include the dates you entered or anything that identifies you.

Third parties

We do not sell, rent, or share personal information, because none is collected. The site may be served through a standard content-delivery network, which can process basic technical request data (such as IP address) to deliver the page securely, as is normal for any website.

Children

This site is intended for a general adult audience seeking pregnancy information and is not directed at children.

Changes

If this policy changes, we will update the date below. Questions? Contact us.

Last updated June 14, 2026.