What this site collects

The short version

No ads, no analytics and no trackers. The site loads its fonts and images from its own server rather than from third parties. Accounts are optional, and the whole course works without one.

Without an account

When you watch an episode or mark it as watched, that is saved in your browser’s local storage on your device. It is never sent to us. Clearing this site’s data in your browser erases it, and the course page lets you download a copy or restore one. The Hardware Lab simulator also saves its progress in your browser. The site sets no cookies for you.

With an account

If you make an account, the site stores:

• the username you choose. Please don’t use your real name or an email address;
• your passkeys’ public keys, the dates they were added and last used, and whether each one is a synced passkey. Your face, fingerprint or screen lock never leaves your device, and the site never receives a private key;
• your course progress, so your devices stay in step;
• one-way fingerprints of your recovery codes, never the codes themselves;
• your assessment results: your best score, how many attempts, when you last tried, and the date and score you passed with;
• your active sign-ins, which expire after 30 days.

It doesn’t collect an email address, a password, your real name or your IP address. While you’re signed in, the site sets one sign-in cookie. During sign-in or sign-up it sets a second cookie that lasts five minutes. Both are strictly necessary and used for nothing else.

From the account page you can download everything stored about your account, or delete it. Deleting removes all of it straight away.

Bot protection

Sign-up and account recovery use Cloudflare Turnstile to check that a person, not a bot, is making the request. It loads only on the account page, and only after you start one of those two forms. It runs a short check in your browser and gives the site a pass or fail. Cloudflare’s Turnstile privacy addendum explains what it processes.

To slow down abuse, the site also counts account requests from each network address over one minute. Those counts aren’t stored or tied to an account.

Assessments

Anyone can take a track’s assessment. Your answers are checked by the site’s server, which keeps the answer key, and nothing about the attempt is stored unless you’re signed in. If you are, your best score, the number of attempts, when you last tried, and the date and score you passed with are saved with your account. A passed assessment gets a record with a random ID. Anyone you share its link with can see your username, the track, the date you passed and the score you passed with. A record doesn’t change once it’s issued, and it disappears if you delete your account.

Videos come from YouTube

Nothing loads from YouTube until you press play. When you do, the episode plays in YouTube’s privacy-enhanced mode (youtube-nocookie.com), and your browser connects to YouTube, which is operated by Google, just as it would for any embedded video. Google’s privacy policy applies to that connection. Links marked “Watch on YouTube” take you to youtube.com.

Donations

The support page lists a Monero address and a Bitcoin address. Paying happens entirely in your own wallet. The site never sees the payment and can’t connect it to you. Bitcoin payments are public on its blockchain, so anyone can see what an address receives. Monero hides amounts and addresses by default. The QR codes are plain images on this site and load nothing else.

Email

If you write to contact@greydivide.com, your message goes through a forwarding address to a private inbox. Your address and message are used only to reply to you. There’s no mailing list, and they aren’t shared.

Hosting

Cloudflare hosts the site. Like any web host, it processes your IP address and basic request details to deliver pages and to protect the site from abuse, and it may set a strictly necessary security cookie if it needs to check for automated traffic.

Changes

If this changes, this page will say so before it happens.

Last updated October 10, 2026.