Privacy

Scoring and practice calculations run on your device. The trainer streak and daily choice are stored in your browser; clearing site storage removes them.

After a daily choice, the site may send the date, chosen cards and a random browser token to its own server for community comparisons. The server stores a day-specific hash of the token and the choice. It does not require your name or an account. Community data is aggregate and self-selected.

The server logs requested paths, response status, user-agent and referring site to measure reliability and crawler use. It does not intentionally log IP addresses in these application logs; hosting providers may keep their own request logs. IP addresses are used temporarily in memory to limit excessive requests.

If the site owner enables Google Analytics or Cloudflare Web Analytics, those services receive usage information under their own policies. Links to CardsJD carry referral parameters identifying this calculator. Sharing buttons open the chosen service only when used.