Hardin Filter is a free browser extension and web tool that automatically verifies AI-generated answers from ChatGPT, Claude, Gemini, and Copilot. It runs eight background checks—including source attribution, fabricated reference detection, and logical consistency—to flag errors before users trust the output. The tool works across Chrome, Edge, Brave, and VS Code, and provides cryptographically signed verification receipts.
- Artificial Intelligence
- AI Agents
- Cybersecurity
- Developer Tools
- Enterprise Software
- Software Only
Funding
Founders
Product
Problem
AI chatbots like ChatGPT, Claude, Gemini, and Copilot frequently produce confident-sounding answers that contain hallucinations, fabricated citations, logical contradictions, or stale information. Users have no efficient way to distinguish reliable output from plausible-sounding errors, creating risk of acting on false information in professional and personal contexts.
Solution
Hardin Filter provides a free browser extension and web-based checking tool that automatically validates AI responses across leading chatbot platforms. After an AI generates an answer, the tool runs eight automated checks in the background—covering source attribution, evidence confidence, fabricated references, numeric consistency, logical coherence, recency, and leak detection—then presents a single clear verdict with pass/fail indicators. The system also offers a Pro tier that compares answers against a user's own documents and policies. Every check produces a cryptographically signed receipt built on the TBN Protocol, allowing users to independently verify the audit trail rather than relying on an opaque trust badge.
Target Audience
Primary users are professionals, researchers, students, and developers who rely on AI assistants for daily work and need to verify that generated claims, citations, and figures are trustworthy before acting on them.
Features
- Eight automated verification checks delivered in one consolidated result: source attribution, confidence vs. evidence, fabricated references (verified against real registries like npm), numeric consistency, logical consistency, recency, and leak detection
- Browser extension for Chrome, Edge, and Brave with a one-minute manual install process that automatically badge-checks answers on ChatGPT, Claude, Gemini, and Copilot websites
- Standalone web tool accessible from any device or browser to paste and verify AI answers without installing software
- Dedicated VS Code extension for in-editor Copilot response verification
- Pro tier (G15) adds document comparison against user-uploaded policies and files for context-specific accuracy validation
- Cryptographically signed verification receipts on the TBN Protocol for independently confirmable audit trails