Privacy

Short version: this site counts visits anonymously and collects nothing that identifies you.

• Anonymous visit counts: pages load a small script from Cloudflare Web Analytics (static.cloudflareinsights.com) that reports page views and page-load performance. Cloudflare states it sets no cookies and does not collect or use visitors' personal data. No advertising, fingerprinting or other third-party scripts.
• Your formulas are checked by JavaScript in your own browser and are never sent anywhere.
• Progress, points and streak are saved in your browser's localStorage under the key efa-progress-v1. They stay on this device. Clear your browser's site data to remove them.
• The hosting provider may keep standard server logs (such as IP address and pages requested) for security and operations, under its own policy.

If anything else changes, this page will say so first.

Last updated 2026-10-30.