Hardin Filter is a browser extension built by Hardin Enterprises Ltd ("Hardin AI", "we", "us") that checks AI-generated answers for fabricated references, leaked data, and unverified claims. This page explains exactly what data the extension processes, why, and what we never do with it.
| Data | When | Why |
|---|---|---|
| Selected/highlighted text | Only when you right-click and choose "Check Selected Text," or on the 4 supported AI chat sites when a new answer appears | Sent to our checking API to run the governance checks (fabricated references, leaked data, source attribution, etc.) |
| Install timestamp | Once, on install | Stored locally in your browser only (chrome.storage.local), for future free-tier usage limits |
| Monthly check counter | Each time a check runs | Stored locally in your browser only, never transmitted to us |
Selected text is sent over HTTPS to our own governance API at tbn.hardinai.co.uk — no third-party service is involved. The text is used only to run the checks and generate a signed receipt of the result. It is not permanently stored in plain form; content is hashed as part of the verifiable receipt.
The extension's automatic checking runs only on: chatgpt.com, chat.openai.com, claude.ai, gemini.google.com, copilot.microsoft.com. On any other site, the extension does nothing unless you explicitly right-click a text selection and choose "Hardin Filter: Check Selected Text" — it never reads or transmits page content without that explicit action.
Locally stored data (install timestamp, usage counter) stays in your browser and is deleted if you uninstall the extension. Server-side, checked text is processed to generate a result and a signed receipt; it is not retained in plain, re-readable form.
If this policy changes, the "Last updated" date above will change and the update will be reflected here. Continued use of the extension after a change constitutes acceptance of the updated policy.
Questions about this policy or the extension: info@hardinai.co.uk
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