G8
Source Attribution
Shows whether claims are backed by a real, checkable source.
🧬 FREE — CHATGPT · CLAUDE · GEMINI · COPILOT
ChatGPT can't give you
unverified answers anymore.
No more hallucinations.
Every AI answer gets checked, automatically, for free. See exactly what's real and what's not — before you trust it.
No account. No install even required if you just want to try it — see below.
HOW IT WORKS
Every answer gets checked automatically.
Hardin Filter runs eight checks quietly in the background every time ChatGPT, Claude, Gemini, or Copilot gives you an answer. You get one clear result showing what passed, what failed, and what needs more evidence — before you decide whether to trust it.
HARDIN FILTER — ANSWER CHECK
!
Contains a reference that does not existFabricated npm package citation detected
ISSUE✓
No leaked data detectedNo sensitive information found
PASSi
No source cited for this answerClaim cannot be independently verified
INFO!
Possible contradiction within the answerLogical consistency check flagged this
ISSUE✓
Not time-sensitiveNo recency concerns
PASSEIGHT POWERFUL CHECKS
One answer. Eight ways to expose the risk.
We'd rather tell you the truth than oversell it — here's exactly what each check does.
G9
Confidence vs Evidence
Checks whether the AI's certainty actually matches its evidence.
G10
Fabricated References
Finds citations, links, and packages that don't actually exist — checked against real registries.
G11
Numeric Consistency
Catches totals, figures, and percentages that don't add up.
G12
Logical Consistency
Finds contradictions hiding inside a single answer.
G13
Recency Check
Flags information that may be stale or time-sensitive.
G14
Leak Detection
Looks for exposed secrets, keys, or personal data in the answer.
G15 · PRO
Your Documents
Compares answers against your own policies and files.
REAL RESULT
Not a mockup of what it might do.
Hardin Filter checking an actual ChatGPT answer — issues found, verdict, confidence score, and a signed receipt.
PEACE OF MIND
"I no longer have to guess whether an AI answer is reliable."
Hardin Filter highlights the problems and gives you a signed result you can verify independently. 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.
✓ Fake references identified
✓ Contradictions highlighted
✓ Signed verification receipt
✓ Works across leading AI tools
SUPPORTED PLATFORMS
Where it works today, and where it doesn't yet.
| Platform | Support |
|---|---|
| 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 |
| VS Code / Copilot in-editor | ✓ Full support — dedicated extension available |
| Firefox | ✗ Not yet — needs a separate build |
| Safari (Mac + iPhone) | ✗ Built, awaiting a Mac-owning tester — see below |
| 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. |
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.
DOWNLOAD
Pick where you use AI. Download. Done.
Every download below is free, no account, no sign-up. Pick the one that matches how you use ChatGPT, Claude, Gemini, or Copilot.
In a browser tab
Chrome, Edge, or Brave
If you use ChatGPT, Claude, Gemini, or Copilot in a regular browser window.
Get Instructions →While coding
VS Code
If you use GitHub Copilot or similar AI suggestions inside VS Code.
Get Instructions →Not sure, or on a phone right now? Use the paste-in tool above instead — works on any device, no download needed.
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
HAVE A MAC?
Help us bring Hardin Filter to Safari.
The Safari version (Mac + iPhone) is built and ready — it just needs someone with a Mac to run one setup step and test it. No coding experience needed, no cost, takes about 20 minutes.
STOP GUESSING
Know whether the AI answer deserves your trust.
Checked. Signed. Verifiable.