Legal & Trust Center
Cookie Policy
Version 1.0 describes how Ethen works today. It has not yet taken effect: passages shown in italics are still being decided, and the document will show an effective date once it is final. Earlier text is listed in the version history.
This Cookie Policy explains the cookies and browser storage used on upcube.ai and in Ethen's web apps: Ethen Chat (chat.upcube.ai), Ethen Studio (studio.upcube.ai) and Ethen Platform (platform.upcube.ai). It lists what each item does, who sets it, how long it lasts where we know, and how you can control it. It is based on an inventory of what these sites actually store. Ethen uses cookies for sign-in, preferences and website analytics. It does not use advertising or cross-site marketing cookies. For how we handle personal data more broadly, see the Privacy Policy.
On this page
What cookies and browser storage are
Cookies are small pieces of data a website asks your browser to store and send back on later visits. Local storage and session storage are similar browser features that let a site keep data on your device. Local storage persists until it is cleared; session storage lasts only while the tab is open. This policy calls all of these "storage" where the difference does not matter.
Storage is first-party when it belongs to the site you are visiting, and third-party when it belongs to another company. Some first-party cookies on Ethen's sites are set by another company's code running on the site, such as Google Analytics. We note this where it applies.
How Ethen's sites share storage
Ethen's sites all sit under the upcube.ai domain. Two kinds of cookies are shared across them:
- Sign-in cookies from Clerk, Ethen's sign-in provider, are shared across the app subdomains so that one sign-in works in Ethen Chat, Ethen Studio and Ethen Platform.
- Google Analytics cookies set by the upcube.ai website are scoped to the whole upcube.ai domain. That means your browser also sends them with requests to the app subdomains, even though the Ethen apps themselves do not load Google Analytics.
Strictly necessary storage
These items are needed to sign you in, keep your session secure and make the apps work. They cannot be switched off without breaking sign-in.
| Name | Type | Set by | Where | Purpose | Duration |
|---|---|---|---|---|---|
__session | Cookie | Clerk (sign-in provider) | Ethen app subdomains | Holds a short-lived token proving you are signed in. | Short-lived; renewed while you are signed in |
__client_uat and a variant with a suffix (for example __client_uat_…) | Cookie | Clerk | upcube.ai and its subdomains | Records when your sign-in state last changed, so every Ethen app sees the same state. | Managed by Clerk |
__client | Cookie (not readable by page scripts) | Clerk | clerk.upcube.ai | Identifies your browser to the sign-in service. | Managed by Clerk |
| Bot-protection cookies | Cookie | Cloudflare (Turnstile) | Shown during some sign-ins | Distinguish people from automated sign-up attempts. | Managed by Cloudflare |
__clerk_environment | Local storage | Clerk | Ethen app subdomains | Caches the sign-in service's configuration. | Until cleared |
Functional storage
These items keep your work and your place in the apps. They stay on your device and are not sent to us as cookies.
| Name | Type | Where | Purpose | Duration |
|---|---|---|---|---|
ethen/scope/<account>/chat.history.v1 | Local storage | chat.upcube.ai | A copy of your recent Ethen Chat conversations, so the app loads quickly and survives reloads. This contains conversation text. | Cleared when you sign out |
ethen/scope/<account>/chat.draft.v1 | Local storage | chat.upcube.ai | Saves a message you are still writing. This contains the draft text. | Cleared when the message is sent or you sign out |
ethen-chat-anonymous-draft-v1 | Session storage (local storage if unavailable) | chat.upcube.ai | Keeps a prompt you started before signing in, so it is not lost when you sign in. | Up to 24 hours |
ethen.studio.handoff.v1, ethen.studio.identity.v1 | Local storage | studio.upcube.ai | Carries your place and selected identity between Studio views. | Until cleared |
ethen:research:recent-runs | Local storage | chat.upcube.ai | References to your recent research runs. | Until cleared |
Because the Ethen Chat history and draft items contain conversation text, anyone with access to your browser profile could read them. Sign out on shared computers.
Preference storage
These items remember choices you make. They stay on your device.
| Name | Type | Where | Purpose | Duration |
|---|---|---|---|---|
ethen-theme | Local storage | All Ethen sites | Your light or dark theme. | Until cleared |
ethen.chat.settings.v1, ethen.chat.sidebar.v1, ethen:v4:sidebar-collapsed | Local storage | Ethen Chat and Studio | Layout and display preferences. | Until cleared |
ethen-chat-model-recents-v1, ethen-chat-selected-video-model-v1 | Local storage | chat.upcube.ai | Recently used models. | Until cleared |
ethen-chat-voice-settings-v1 | Local storage | chat.upcube.ai | Voice preferences. | Until cleared |
ethen.studio.settings.v1, ethen.studio.sidebar.v1, ethen.studio.nav.groups.v1, ethen.studio.model-favorites.v1, ethen.studio.model-recents.v1, ethen-console:rail-v1, ethen:eds-workspace:divider-width | Local storage | studio.upcube.ai | Studio layout, favorites and recently used models. | Until cleared |
Analytics
The upcube.ai website uses Google Analytics 4, a service from Google, to understand how visitors use the site: which pages are viewed, how visitors arrive, and general device and location information derived from the connection. Google Analytics loads on every page of upcube.ai. It does not load inside the Ethen Chat, Studio or Platform apps.
| Name | Type | Set by | Where | Purpose | Duration |
|---|---|---|---|---|---|
_ga | Cookie | Google Analytics, running on upcube.ai | upcube.ai and its subdomains | Distinguishes visitors with a random identifier. | Google's default (Google documents up to two years) |
_ga_EZLC0KG6GX | Cookie | Google Analytics | upcube.ai and its subdomains | Keeps session state for Ethen's analytics property. | Google's default |
Google processes this data under its own terms. You can learn how Google uses information from sites that use its services in Google's own documentation.
Upcube is deciding how visitors to upcube.ai will be able to accept or refuse analytics cookies. This section will describe that control before this policy takes effect. Until then, you can block or delete these cookies using the browser controls described below.
What Ethen does not use
Ethen does not use:
- advertising or retargeting cookies;
- social-media tracking pixels;
- cross-site tracking for marketing.
Ethen's apps do not run third-party analytics or session-recording tools. Ethen never stores your Prompts in cookies; conversation content is stored on our servers and, as described above, in your browser's local storage.
If billing is introduced, the payment provider may set its own cookies during checkout. This policy will be updated before that happens.
How to control storage
- Sign out. Signing out of Ethen ends your session and clears the Ethen Chat history and draft copies kept in that browser.
- Browser settings. You can view, block or delete cookies and site data for upcube.ai and its subdomains in your browser's privacy settings. Blocking strictly necessary cookies will prevent you from signing in.
- Google Analytics. You can block analytics cookies in your browser settings, use a content blocker, or install Google's opt-out browser add-on for Google Analytics.
- Private browsing. A private or incognito window discards cookies and local storage when it closes.
Changes to this policy
We update this policy when the storage Ethen uses changes. The version history below records each change.
Contact
Dedicated contact channels for privacy, security, legal, support and abuse reports are being set up and will be listed here before Ethen's policies take effect.
Version history
| Version | Date | Status | Summary of changes |
|---|---|---|---|
| 1.0 | October 5, 2026 | Not yet in effect | Rewritten from an observed storage inventory. Discloses Google Analytics and the browser storage that holds conversation drafts. |
| 0.9 | September 2026 | Superseded | Earlier public-preview text. Archived. |