# FactSentinel - AI-Powered Fact-Checking

> Stop misinformation before it spreads with AI-powered real-time fact verification.

FactSentinel is an AI-powered fact-checking platform that helps users identify false claims and misinformation online. Available as both a website and Chrome browser extension, it uses multi-model AI consensus for accurate, instant verification.

## Company Information

- **Website:** https://factsentinel.com
- **Type:** SaaS Platform + Browser Extension
- **Industry:** Media Literacy / Misinformation Detection
- **Extension:** Available on Chrome Web Store

## How It Works

1. Submit any claim or enable passive monitoring
2. Multiple AI models analyze the claim simultaneously
3. Receive a consensus verdict with confidence rating
4. View sources and reasoning behind the verdict

## Core Features

### Manual Fact-Checking
- Submit any text claim for instant verification
- Multi-model AI consensus (OpenAI + Anthropic)
- Detailed verdicts: LIKELY TRUE, LIKELY FALSE, UNCLEAR, etc.
- Source citations and reasoning

### Passive Monitoring (Extension)
- Automatic scanning of web pages for claims
- Real-time highlighting of potential misinformation
- Non-intrusive notifications
- Configurable sensitivity

### Two Operating Modes
- **Platform Mode:** FactSentinel handles AI API calls server-side
- **BYOK Mode:** Bring Your Own Keys for complete privacy (queries never touch our servers)

### Multi-Model AI
- OpenAI GPT-4o / GPT-4o-mini
- Anthropic Claude Sonnet 4 / Haiku 4
- Consensus-based verdicts for higher accuracy

## Pricing Plans

### Free Platform
- 10 manual checks/month
- 20 passive monitoring checks/month
- Free forever

### Platform Subscription
- $5/month
- 200 manual checks/month
- 500 passive monitoring checks/month

### BYOK License
- $29 one-time purchase
- Unlimited checks with your own API keys
- Complete privacy - zero-knowledge verification

## Site Pages

### Main Pages
- [Home](https://factsentinel.com/) - Platform overview
- [Features](https://factsentinel.com/features) - Feature details
- [Pricing](https://factsentinel.com/pricing) - Plan comparison
- [Download](https://factsentinel.com/download) - Browser extension
- [Demo](https://factsentinel.com/check) - Try fact-checking

### Industry Solutions
- [For Journalists](https://factsentinel.com/for-journalists)
- [For Fact-Checkers](https://factsentinel.com/for-fact-checkers)
- [For Educators](https://factsentinel.com/for-educators)
- [For Researchers](https://factsentinel.com/for-researchers)

### User Account
- [Register](https://factsentinel.com/register) - Create account
- [Login](https://factsentinel.com/login) - Sign in
- [Dashboard](https://factsentinel.com/dashboard) - User stats
- [Account](https://factsentinel.com/account) - Settings

### Resources
- [Fact Checks](https://factsentinel.com/fact-checks) - Popular verifications
- [Help](https://factsentinel.com/help) - Documentation
- [Feedback](https://factsentinel.com/feedback) - User feedback

### Legal
- [Terms of Service](https://factsentinel.com/terms)
- [Privacy Policy](https://factsentinel.com/privacy)

## API (Extension-Only, Currently)

The API is currently available only for the official browser extension:

- `POST /api/v2/verify.php` - Fact-check a claim
- `GET /api/v2/whoami.php` - Get user session info
- `GET /api/v2/limits.php` - Get rate limits (public)
- `POST /api/v2/extract-and-verify.php` - Passive monitoring endpoint

*Public API planned for Q2-Q3 2026*

## Technology

- Multi-model AI consensus
- Real-time claim extraction
- Redis-based rate limiting
- Secure API key management for BYOK
- Chrome Extension (Manifest V3)

## Target Audience

- Individuals concerned about misinformation
- Journalists verifying claims during research
- Professional fact-checking organizations
- Educators teaching media literacy
- Researchers studying misinformation
- Privacy-conscious users (BYOK mode)

## Browser Extension

### Features
- One-click manual fact-checking
- Passive monitoring of web pages
- Claim highlighting and annotations
- Works with or without account
- BYOK mode for complete privacy

### Installation
Available on the [Chrome Web Store](https://factsentinel.com/download)

## FAQ

**Q: How accurate is the fact-checking?**
A: We use multi-model consensus from leading AI providers, which significantly reduces false positives and negatives compared to single-model approaches.

**Q: Is my data private in BYOK mode?**
A: Yes. In BYOK mode, your claims are sent directly to AI providers using your own API keys. FactSentinel never sees your queries.

**Q: What claims can I check?**
A: Any factual claim. The AI works best with specific, verifiable statements rather than opinions or predictions.

**Q: Do I need an account?**
A: Guest users get 3 free checks. Create a free account for 10 monthly checks.

## Contact

- **Website:** https://factsentinel.com
- **Support:** https://factsentinel.com/contact
- **Feedback:** https://factsentinel.com/feedback

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*Last updated: December 2025*