Privacy policy

Last updated June 27, 2026

Your birthdate

Your birthdate is used only in your browser to calculate the grid of weeks. It is never transmitted to or stored on any server. If you use the "Share link" feature, your birthdate and chosen lifespan are encoded into the link you copy so the recipient sees the same grid — sharing that link is entirely your choice.

Local storage

Your birthdate, lifespan and light/dark theme choice are saved in your browser's local storage so the tool remembers them next time. This data stays on your device and you can clear it any time from your browser settings.

Analytics and advertising

We may use privacy-respecting analytics to count visits, and we may display advertising to keep the tool free. If advertising is enabled, third-party providers such as Google may use cookies to serve relevant ads; you can control this through your browser and ad settings. No advertising partner receives your birthdate.

Contact

Questions about privacy? Reach us via the contact page.