Privacy and site data

Optional accounts and private answers

You can sign in with ChatGPT to save answers to the daily challenge and seven-day reset. OpenAI Sites handles sign-in and its authentication cookies. NDZ receives a stable site-specific user ID and your email address; the email is displayed while you are signed in and is not stored in the answers database.

When you press Save, NDZ stores your user ID, answer, challenge, chosen level where applicable, completion status, language and update time in Cloudflare D1. Answers are private to your signed-in account, not published. Avoid sensitive information. You can keep up to 200 answers of 2,000 characters each; seven-day reset answers are replaced when you edit the same day.

Answers remain until you delete them through My answers. You can delete one answer or all saved NDZ data. NDZ keeps no separate profile. Deletion removes the application’s answer records, not your ChatGPT account or provider logs and backups; provider retention and processing locations have not been verified.

Paper notes and the downloaded workbook sample are not sent to NDZ.

Forms and purchases

This version has no contact form, email signup, newsletter subscription or checkout. The full workbook and Excel tools are not available to purchase. The free PDF download does not ask for an email address.

Tracking and browser storage

NDZ has not added advertising pixels, audience analytics, session recordings or marketing cookies. Its application does not store visitor notes or identifiers in your browser’s local or session storage. Signing in uses platform-managed cookies. Written drafts stay in page memory until you explicitly save; leaving or refreshing discards unsaved edits.

Hosting and security cookies

The site is published through OpenAI Sites and delivered through Cloudflare. Hosting and security services handle technical request information, such as your IP address, requested page and browser information, to deliver and protect the site.

A Cloudflare cookie named __cf_bm was observed on the public site. Cloudflare uses it for bot protection and states that it expires after 30 minutes of inactivity. It is separate from advertising tracking.

See Cloudflare’s cookie explanation for details. Provider settings may affect which security cookies appear. This page does not promise that every visit is cookie-free.

Files and external services

The sample PDF, images and fonts do not require an embedded social network, video player or remote font service. The PDF and images are served with the site; text uses your device’s system fonts. Downloading a file still sends a request to the hosting service.

Links to another provider take you to that provider’s site, where its own privacy practices apply. We have not verified a single retention period or processing location covering all hosting and security records.