Privacy
The short version: no ads, no tracking cookies and no accounts. Your progress stays in your own browser.
Your progress
When you finish an experiment, your score, XP and streak are saved in your browser's local storage on this device. They are not sent to us. Clearing your browser data removes them.
Analytics
We use Cloudflare Web Analytics to count page views. It doesn't use cookies and doesn't follow you across other websites.
Weekly email
If you sign up for the weekly email, your address is stored by our email provider and used only to send that email. Every email has an unsubscribe link.
Hosting
The site runs on Cloudflare, which processes standard request data such as IP addresses to deliver pages and protect against abuse.
Last updated November 2026.