🧬 FREE BROWSER EXTENSION — CHATGPT · CLAUDE · GEMINI · COPILOT

Pour in an AI answer.
Pour out the truth.

AI gives you answers fast, but not all of them are clean. Some are guesses dressed up as facts. Hardin Filter works like a water filter for AI — it strains out the unreliable parts, so what's left is safe to trust.

Add to Chrome — Free Or paste an answer to check it now
Raw AI
Answer
→
🧬
Hardin Filter
→
Checked,
Signed Answer
How It Works

Eight checks run quietly in the background.

Every time ChatGPT, Claude, Gemini, or Copilot gives you an answer, Hardin Filter checks it against eight different failure modes — before you decide whether to trust it.

G8
Source Attribution
G9
Confidence vs Evidence
G10
Fabricated References
G11
Numeric Consistency
G12
Logical Consistency
G13
Recency Check
G14
Leak Detection
G15
Your Documents
(Pro)
What You See

A simple checklist. No jargon.

Example: an AI claims a company policy allows 90-day refunds. Hardin Filter checked it against the company's actual policy document.

No references to check
No leaked data detected
No source cited for this answer
Tone matches evidence
Not time-sensitive
Not confirmed by, may conflict with, your documents
The Part Nobody Else Does

Every check comes with a signed receipt.

Not just a green tick you have to trust — a cryptographically signed record of exactly what was checked and what was found. Built on TBN Protocol. Share it, and anyone can verify it independently.

Supported Platforms

Where it works today, and where it doesn't yet.

We'd rather tell you the truth than oversell it. Here's exactly what's covered right now.

PlatformSupport
Chrome (Windows, Mac, Linux, ChromeOS)✓ Full support — extension works today
Edge, Brave (Chromium-based)✓ Same extension usually works
Any device, any browser (paste manually)✓ Use the web tool below — works everywhere
Firefox✗ Not yet — needs a separate build
Safari✗ Not yet — different extension system
Mobile apps (ChatGPT app, Claude app, etc. on iOS/Android)✗ Not supported — browser extensions can't reach native apps. Use the web tool below instead.
VS Code / Copilot in-editor✗ Not yet — on the roadmap
Works On Any Device

No extension? Paste it here instead.

On your phone, using an app instead of a browser, or just want to check one answer without installing anything? Copy the AI's answer and paste it below.

Supported Platforms

Honest about what works today, and what's next.

Hardin Filter is a browser extension. It works anywhere Chrome (or a Chromium-based browser) runs — but there are real limits worth knowing before you install.

✓
Works now
Chrome — Windows, Mac, and Linux
✓
Works now
Edge & Brave (Chromium-based)
◐
Planned
Firefox extension
◐
Planned
VS Code (for Copilot/Cursor)
✗
Not supported
Mobile apps (ChatGPT/Claude apps on iOS/Android)
✗
Not supported
Safari (Apple's extension system is very restrictive)

Why the mobile gap: browser extensions can't run inside native mobile apps — that's a platform limitation, not something we can code around. If you use ChatGPT or Claude through a desktop browser, you're covered.

Getting Started

Install in under a minute.

1
Add the extension to Chrome

One click. No account required to start.

2
Use AI normally

ChatGPT, Claude, Gemini, Copilot — Hardin Filter watches quietly in the background.

3
See the checklist after every answer

A small badge appears. Click it to see exactly what was checked.

Get Early Access
Pricing

Free to use. Simple to upgrade.

Free
£0 / forever
  • 20 checked answers / month
  • All 7 core checks (G8–G14)
  • Signed receipts
  • Works on ChatGPT, Claude, Gemini, Copilot
Pro
£7 / month
  • Unlimited checked answers
  • All 7 core checks (G8–G14)
  • Bring your own documents (G15)
  • Export & share receipts
  • Priority support

Stop guessing if AI told you the truth.

Get Early Access — Free