Privacy policy

Effective: 2026-10-31

1. What we collect

There is no account system, and we do not ask for names, emails or ages. The age picked under “Learn”, the nickname typed under “My growth”, and all stars, XP and badges are stored only in your browser (localStorage) and are never sent to a server.

2. Server logs

The site is served as static files on Cloudflare. Cloudflare may keep short-term access logs (IP address, time, browser type) for security and reliability. We do not use them to identify anyone.

3. Third parties

Fonts are loaded from Google Fonts (your IP address reaches Google when the font files are requested). There are no ads inside the practice screen; if ads are added to informational pages, we will say so here.

4. Cookies

We use no tracking cookies. Records are kept in localStorage, not cookies.

5. Deleting records

Use “Erase my records” at the bottom of “My growth”, or clear the site data in your browser, to delete everything.

6. Changes

If accounts are introduced, this policy will be updated first and the effective date changed.