Privacy policy

Last updated: July 2026.

The short version

ChronoAge Pro is a static website with no accounts and no server-side processing. Every calculation happens locally in your browser. The dates of birth, test dates and caseload labels you enter are never sent to us or anyone else — they stay on your device. Because student dates of birth are sensitive, this is architectural: there is no network path for that data to leave.

What we store on your device

Caseload rows and your light/dark theme choice are kept in your browser'slocal storage so they are there next time. This never leaves your browser, we cannot read it, and you can clear it any time through your browser settings.

Analytics

At present ChronoAge Pro uses no analytics and sets no tracking cookies. If privacy-respecting, aggregate analytics (such as Google Analytics 4) are added later to understand which pages are useful, this page will be updated to disclose exactly what is collected — and it will only ever measure page visits, never the dates you enter.

Advertising

ChronoAge Pro currently shows no ads. If advertising (such as Google AdSense) is added in future, those services may set their own cookies; we will update this page and — where required, for example for visitors in the EEA and UK — ask for your consent through a banner before those cookies are set.

Your data stays on your device

The calculators are entirely client-side: there is no database of students, no email list you are added to without asking, and nothing for us to sell. This is a deliberate design choice, not a promise we have to police.

Contact

Questions about privacy? Reach us via the contact page.