Privacy.

Aggregated, anonymized analytics about visits to the site: pages viewed, approximate country (derived from IP, then discarded), browser type, screen size, language, referrer, and a non-personally-identifying anonymous id stored in your browser. We do not collect your name, email, address, phone number, or any account information, because we do not have accounts.

PostHog (EU servers) for product analytics, with IP anonymization enabled at the project level: PostHog discards your IP address before storing the event. Vercel Analytics and Vercel Speed Insights for aggregated traffic and performance metrics, both running in cookieless mode. That is the entire stack.

PostHog stores a small anonymous identifier in your browser (localStorage and a first-party cookie) so repeated visits are counted as one person rather than many. We also use localStorage to remember your theme preference (light/dark). We do not use third-party advertising cookies, retargeting pixels, or fingerprinting.

We use this data only to understand which content is useful and which is not, so we can improve the lessons and tools. We do not run ads, do not segment users for marketing, do not sell or share the data with third parties for their own purposes, and do not build commercial profiles of readers.

Under GDPR (EU/UK) and similar laws, you have the right to request access to, correction of, or deletion of personal data we hold about you. Because we do not collect identifying information, we may not be able to locate "your" data, but you can clear it from your browser at any time by deleting site data, or by enabling "Do Not Track" or a content blocker, both of which we honor.

Questions about privacy: write to hi@gonzalofuentes.com.