Introduction

Cruxr.ai ("we", "us", or "our") operates this website as a personal learning and reference resource. This Privacy Policy explains what information we collect, why we collect it, and how we protect it. By using the site you agree to the practices described here.

Information We Collect

We collect only the information necessary to operate the site:

  • Usage data: Standard server logs may record your IP address, browser type, referring URL, and pages visited. These logs are used solely for debugging and are not shared with third parties.
  • Cookies: We store a single cookie to remember your language preference (EN/ES). No tracking or advertising cookies are used.
  • No account data: The site does not require registration. We do not collect names, email addresses, or payment information.
  • Article ratings: When you rate an article (1-5 stars), we store an irreversible hash of your IP address to prevent duplicate submissions. The original IP address is never stored. The hash is used solely for deduplication and is not shared with third parties.

How We Use Your Information

Log data is used exclusively to maintain site stability and diagnose technical issues. The language cookie is used to remember your preferred language between visits. Article ratings are used to improve content quality. We do not sell, trade, or transfer any data to third parties.

Third-Party Services

The site loads the following resources from external CDNs:

  • Google Fonts (Inter typeface) — subject to Google's privacy policy.
  • jsDelivr CDN (KaTeX for math rendering) — subject to jsDelivr's privacy policy.

These requests may expose your IP address to those services. We do not control their data practices.

Data Retention

Server logs are retained for a maximum of 30 days and then deleted. The language preference cookie expires after 365 days. Article ratings and associated IP hashes are stored indefinitely to maintain deduplication.

Your Rights

Because we do not collect personal data beyond transient server logs, there is no personal profile to access, correct, or delete. If you have concerns, please contact us and we will respond promptly.

Changes to This Policy

We may update this Privacy Policy occasionally. Material changes will be reflected by a new effective date at the top of this page.

Contact

For any privacy-related questions, contact us at hello@cruxr.ai .