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Privacy
Your progress (your scores and which lessons are open) is kept only in your own browser (localStorage). We never see it.
On the live site we count visits without cookies (Vercel Web Analytics). Nothing is kept that could identify you.
If a script on a page goes wrong, a short error report is sent to our server: the page, the message, the site version and your browser's name. Nothing about you.
If you use the contact form, your message is emailed to us. It is not stored on the site.