Privacy

Effective July 2026.

The short version

We don't want your data. There are no accounts, no tracking cookies, no email capture, and no advertising. Your calculator inputs are processed entirely in your browser and are never sent to a server.

What we do measure

• Cookieless page analytics (Cloudflare Web Analytics): aggregate page views and performance, with no cookies and no cross-site tracking.
• Anonymous usage events: counts like “a scenario was modeled,” with no identifiers and no ability to link events to a person. These power public aggregate stats.
• Error reports: if the site crashes, an automated error report may be sent so we can fix it; reports are scrubbed of anything identifying.

Shared links

A “share” link encodes the scenario numbers in the URL itself. We don't store it — anyone you send it to can reconstruct the scenario, so share links like you'd share the numbers.

Children

The Site is for parents and adults planning on a child's behalf and does not knowingly collect information from anyone, children included.

Contact

Questions can be raised through the project's public repository.