Cookie Policy
Last updated: October 2026
This page lists every cookie this site sets, what each one is for and how long it lasts. We set no analytics, advertising or tracking cookies.
Joining a live session as a player with a nickname sets no cookie: the player’s session token is held in the page’s memory only.
| Cookie | Purpose | Duration |
|---|---|---|
__Secure-better-auth.session_token | Keeps you signed in to your account. Set when you sign in and removed when you sign out. It holds a random token, not your name or email address. | 7 days, renewed while you keep using the site |
axiomiq-locale | Remembers the language you chose in the language selector. Set only when you choose one. | 1 year |
axiomiq-theme | Remembers the colour theme you chose in the theme selector. Set only when you choose one. | 1 year |
axiomiq_lti_state | Protects a sign-in from your school’s learning management system (LTI) against forgery while it completes. Set only when you open Zembil from such a system. | 10 minutes |
axiomiq_lti_launch | Links a launch from your school’s learning management system to the assignment you open next. It holds a random token. Set only when you open Zembil from such a system. | 10 minutes |
axiomiq_learner | Lets you return to an assignment you opened with a link, code or class card, without an account. It holds only random identifiers and your nickname, signed so they cannot be altered. Set only when you start such an assignment. | Up to 180 days; a link assignment’s entry ends a week after it closes |
Why these cookies
The sign-in and learning management system cookies are strictly necessary for a service you asked for. The language and theme cookies store a choice you made. None of them is used to follow you across other sites or to show you advertising.
Local storage
Some preferences are also kept in your browser’s local storage, which is not a cookie: among them your language and theme choice and your answer to the cookie banner. Local storage stays in your browser and is not sent to our servers with your requests.
The cookie banner
This site sets no optional cookies, so either answer to the cookie banner leaves the cookies above unchanged. Your answer is kept in local storage only so that the banner does not ask again.
Removing cookies
You can delete these cookies at any time in your browser settings. Deleting the sign-in cookie signs you out.