Accounts
An account is optional. It holds your username, your password and your recovery code (both stored scrambled, so nobody can read them, including us), and which lesson sections you have finished. Your username is visible only to you.
Your account stays until you delete it from your account page, which removes your progress too.
Cookies
The site uses at most two cookies, only for logging in and remembering progress:
- A session cookie keeps the forms on the site secure, remembers which lesson sections you finished before making an account, and lets the site show you a new recovery code for up to 15 minutes. Progress kept this way stays in your browser for a year from your last visit, or until you clear your cookies.
- A login cookie, set only when you log in, keeps you logged in on that device for up to 30 days.
If you use the light or dark switch at the top of the page, your browser keeps that choice in its own storage on your device.
Server logs
Like almost every website, our web server writes a short-term log of the pages it serves, including the internet (IP) address and browser type of each visitor. We use these logs only to keep the site running and safe, and delete them regularly.
Visitor statistics
We count visits with Plausible Analytics, which works without cookies, to see which pages people read and how they found the site. Plausible's data policy explains what it records.
Plausible's script is the one file that comes from outside carboncarbon.bond. Every other font, script and image is served by carboncarbon.bond itself.