Privacy Policy

Last Updated: June 13, 2026

At Period Calculator Pro, we believe that your health data is your most private information. Our website is designed to be a tool that serves you without compromising your anonymity.

1. Zero-Knowledge Architecture

We operate on a "Zero-Knowledge" basis. This means:

• No Data Storage: We do not have a database to store the dates, cycle lengths, or period durations you enter.
• Local Processing: All calculations are performed in your browser using JavaScript. The data never leaves your device and is never sent to our servers.
• No Accounts: You do not need to create an account or provide an email address to use our tools.

2. Cookies and Tracking

We do not use tracking cookies or third-party analytics scripts that identify you. We may use essential session cookies only for technical functionality (such as remembering your preference for dark mode, if applicable), but these do not contain any personal or health data.

3. Third-Party Links

Our website may contain links to other sites. Please be aware that we are not responsible for the content or privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of any other site that collects personally identifiable information.

4. Changes to This Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page. You are advised to review this Privacy Policy periodically for any changes.

5. Contact Us

If you have any questions about this Privacy Policy, please contact us.