Your Shield Against Misinformation
Auto-Protection scans pages as you browse, alerting you to false claims before they mislead you.
Instant Verification
Select any text on any webpage, right-click, and get comprehensive fact-checking results in seconds. Our browser extension integrates seamlessly with your workflow.
- One-click fact-checking from any webpage
- Works in Chrome (Firefox and Edge coming soon)
- Results appear in seconds, not minutes
- Context-aware analysis
Multi-AI Consensus
Why trust a single opinion? FactSentinel cross-references the world's most advanced AI systems to deliver fact-checks you can actually rely on.
- Multiple perspectives: Analysis from OpenAI and Anthropic's frontier models
- Always current: We continuously upgrade to the latest, most capable AI
- Cross-verified: Conclusions validated across independent systems
- Transparent: Source citations included with every check
Privacy-First Design
Choose your level of privacy. Use Platform mode for quick start, or bring your own OpenAI/Anthropic keys for maximum privacy. In BYOK mode, requests go directly to AI providers, so we never receive your keys or claim text.
- Your API keys stay local in your browser (never sent to our servers)
- BYOK claim text never reaches our servers
- Platform data encrypted in transit and at rest
- Switch modes anytime
Research History
Keep track of all your fact-checks and organize your research. Export and cloud sync are coming soon.
- Searchable fact-check history
- Filter by verdict, source, or date
- Expandable details for each check
- Export and cloud sync coming soon
Auto-Protection
Your always-on shield against misinformation. FactSentinel scans pages automatically as you browse, alerting you to false claims on news sites, social media, and blogs before they mislead you.
Always Protected
Scans pages as you browse
Smart Alerts
Only notifies for high-confidence issues
Privacy Preserved
Works with your own keys for maximum privacy
Generous Free Tier
50 protection scans/mo free
Platform vs Your Own Keys
Both modes offer powerful fact-checking - the difference is in setup time and privacy level.
| Feature | Platform Mode | Your Own Keys |
|---|---|---|
| Setup Time | 10 seconds | 5 minutes |
| Privacy | Standard encryption | Privacy-first |
| Free Manual Checks | 10/month | 100/month |
| Free Auto-Protection Scans | 50/month | 200/month |
| Premium Limits | 200 manual + 500 auto-protection | Unlimited |
| AI Models | OpenAI + Anthropic frontier models | Your choice of models |
| AI Costs | Included | You pay providers directly |
| Query Logging | Encrypted, stored for service quality | Claim text never reaches our servers |
Ready to Browse with Confidence?
Get protected from misinformation in seconds. Choose your mode and start browsing safely.