Effective August 6, 2026 — Version 1.0
The short version
scienium uses only the browser storage it needs to sign you in and remember what you were doing. There is no advertising cookie, no analytics cookie, no social-media pixel, no session recording, and nothing that follows you to another website.
That is also why you will not see a cookie pop-up here. A consent banner exists to ask permission for optional tracking. scienium has none, so a banner would have nothing to ask you about — and a banner offering a "reject" button that does not actually turn anything off would be worse than no banner at all. This page is the honest version of that pop-up: everything we store, listed.
Everything scienium stores in your browser
| Name | Type | Set by | What it is for | Set when |
|---|---|---|---|---|
__session | Cookie | Our authentication provider | Holds your signed-in session. This is the cookie that keeps you logged in between pages. | When you sign in |
__client_uat | Cookie | Our authentication provider | Records only whether you are signed in, so the server can render the right version of a page. Its value on a signed-out visitor is 0. | On any page |
__clerk_environment | Local storage | Our authentication provider | Caches the sign-in configuration so the sign-in form does not have to re-fetch it every time. | On any page |
pvp_active_raid_session | Local storage | scienium | Remembers that you are in the middle of a Battle Arena raid, so refreshing the page does not lose the raid. | Only during a raid |
Our authentication provider may also set a short-lived cookie to block automated sign-in attacks. It exists to stop bots, holds no information about you, and is part of signing in safely.
The Data Terminal downloads a Python engine the first time you open it, and your browser caches that download the same way it caches an image. It is program code, contains nothing about you, and is cleared with your normal browser cache.
None of the above is used to build a profile of you, and none of it is shared with an advertiser or a data broker. We do not sell personal information and we do not share it for cross-context behavioral advertising — see the Privacy Policy for the full picture.
How to refuse or remove it
- Before you sign in, the only thing stored is the signed-in/signed-out marker and the cached sign-in configuration. Neither identifies you. If you would rather not have them, you can browse with cookies blocked for this site — the public pages, including this one and the Privacy Policy, are readable with cookies switched off.
- You can clear everything at any time through your browser's "Clear site data" or "Cookies and site data" setting, or by blocking cookies for https://scienium.app. Every browser has this control; it is the same one a consent banner would ultimately be setting on your behalf.
- Refusing the session cookie means you cannot sign in. That is not a design choice we can work around — the cookie is the sign-in. Nothing else on this list is required to read the public pages.
- To ask what we hold about an account, or to have it deleted, email hello@scienium.app. For a student under 18, the school approves the request, because authority over a minor's school record belongs to the school.
Do Not Track and Global Privacy Control
scienium does not track anyone across third-party websites, so there is no cross-site tracking for these signals to switch off. We honor a Global Privacy Control signal as a request to opt out of the sale or sharing of personal information. We do neither, so the signal does not change how your data is handled — it was already the case.
If this ever changes
If scienium ever adds analytics, advertising, or any third-party script that is not required to run the service, we will ask for your permission before it loads, not after, and this page will be updated to say so on the same day. Until then, the list above is the whole list.
Questions about anything here: hello@scienium.app.