Privacy Policy

Last updated: 27 October 2026.

DueDateCalc is built so that there is almost nothing to protect: the calculators run entirely in your browser, and the dates you enter are never transmitted to, stored on, or logged by any server we control.

What we collect

• Calculator inputs: nothing. Dates and cycle lengths are processed locally on your device and are gone when you close the tab.
• Accounts: none. There is no sign-up and no login.
• Cookies: the site sets no tracking cookies of its own.
• Hosting logs: the site is served as static files by Cloudflare Pages, which may process standard technical request data (such as IP address and user agent) to deliver pages and protect the service, under Cloudflare's own policies.

What we never do

We never sell personal data, never receive your health-related inputs, and never build profiles of visitors' pregnancies. Because your dates never leave your device, there is nothing for us to share, leak or delete on request.

Changes

If a future feature (such as the planned supporter tier) changes any of this, this page will be updated before the feature launches.