Cookie Policy
The cookies and browser storage Scivra uses
Last updated: October 15, 2026
Scivra keeps cookies and browser storage to a minimum. We do not use advertising or cross-site tracking cookies, so there is no cookie banner. This page lists what is stored in your browser.
Cookies set by Scivra
| Name | Purpose | Duration |
|---|---|---|
better-auth.session_token and related better-auth.* cookies | Keep you signed in and protect your account | Until you sign out or the session expires |
scivra_ns | A one-way hashed identifier that keeps each account's lab progress separate on a shared device. It contains no name or email address | Until you sign out or delete your account, or when your sign-in session expires |
scivra_first_source | First tagged-link source, medium, campaign and content, landing path and first-visit time, used to count registrations and payments by source. Signed, first-party, HttpOnly; not read or updated on learning pages or parent payment pages | 30 days from the first tagged visit, without extending on later visits |
sidebar_state | Remembers whether the sidebar on account settings pages is open | 7 days |
Browser storage used by Scivra
| Key | Purpose |
|---|---|
theme | Remembers light or dark mode |
Keys starting with scivra:<id>: (on lab pages) | Your saved lab progress: predictions, notebook entries and answers, kept separately for each account (or a guest space when signed out). Stored only on your device, never sent to our servers |
scivra:storage-event and keys starting with scivra:storage-event: | A short signal used after you delete your account, so other open tabs and labs in the same browser clear that account's saved progress. Contains no lab work |
lab3d:quality, lab3d:ui:panel | Remember the graphics quality and panel layout you chose for labs on this device. Shared by all accounts on the device |
Third-party cookies
- Crisp (chat window, on public and account pages only) may set cookies to keep a chat conversation going. See Crisp's privacy policy.
- Stripe may set cookies on its own checkout and billing pages, which are hosted by Stripe, for fraud prevention. See Stripe's privacy policy.
- Cloudflare Turnstile (sign-up page) may use browser signals to check for bots.
Cloudflare Web Analytics does not set cookies. Our separate first-source cookie is described above; it does not contain a full URL, referrer or IP address. No third-party tracking script is added for account conversion counts. Lab pages (/learn and /labs) load no analytics or chat tools.
Managing cookies
You can clear cookies and site data in your browser settings at any time. Clearing them will sign you out and remove lab progress saved on that device.