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Privacy Information

Effective Date: 2026-08-15

1. What Hyperion Stores

Hyperion is a local-first interface. The actual implementation guarantees the following behaviors:

  • No Server Database: Hyperion does not operate a server-side chat database. No conversations are uploaded to or stored by Hyperion.
  • No Account System: There is no user account system within Hyperion.
  • API Key Lifecycle: The OpenRouter API key you provide is runtime-only. It is kept strictly in memory while the application is open. It is not persisted to localStorage, IndexedDB, or cookies. Closing or reloading the tab discards the key.
  • Chat History: Chat history is not automatically persisted locally. Each session is fresh, and cross-session memory does not exist.
  • System Prompt Presets: If you choose to save system prompt presets, those presets are stored strictly locally in your browser's `localStorage`.
  • Exports: Conversation exports are generated locally by your browser. No server is involved in creating the JSON file.
Security & Isolation RecommendationIn the hosted version, your browser holds credentials in memory during the session. We strongly recommend cloning the open-source repository and running Hyperion locally. The local version includes an option to use a `.env` file (`OPENROUTER_API_KEY`) which securely proxies requests so the key never touches your browser memory.

2. What Leaves the Browser

When you send a message, the request travels directly:

Browser → OpenRouter → Selected Model Provider

Hyperion itself is not the AI model provider. We merely provide the interface that constructs the API request to OpenRouter.

3. Third Parties

Hyperion acts as a client for OpenRouter. When you use Hyperion, your prompts and chat history within that specific session are transmitted to OpenRouter.

OpenRouter's retention policies, data usage, and the policies of the underlying model providers apply. Please review OpenRouter's current policies at openrouter.ai/privacy.

4. Erasing Local Data

Because Hyperion relies almost entirely on runtime memory, you can erase most of its state simply by closing or refreshing the page.

If you have saved system prompt presets, you can delete them individually within the application settings, or you can clear your browser's site data (localStorage) for this domain to remove all saved presets instantly.

Note: Deleting local Hyperion data does not erase information that has already been transmitted to OpenRouter or the model providers.