Privacy Policy
The short version: we collect almost nothing.
What we don't collect
- No accounts, names, or email addresses — the site has no sign-up.
- No advertising or cross-site tracking cookies.
- Code you type into the playgrounds is never sent to our servers; it runs in your browser.
Your learning progress
Your lesson and quiz progress is saved on your own device, in your browser. It never leaves your browser, and you can delete it at any time by clearing this site's data in your browser.
Standard technical processing
- Our hosting provider processes basic connection data, such as your IP address and the page you asked for, to deliver pages and protect the site.
- Fonts come from an outside font service, which receives your browser's request for them.
- If something breaks, an error-monitoring service receives a technical error report so we can fix it.
Children
The For Kids section works the same way as the rest of the site: no accounts and no personal data collection.
Changes
If this policy changes, the updated version will be published on this page.