AI Fact Checker Browser Extension
Check claims from the page you are already reading. FactSentinel shows verdicts, confidence, model agreement or disagreement, reasoning, and sources so you can inspect the evidence before sharing.
Fact-checking should stay close to the moment of reading.
Questionable claims usually appear inside articles, newsletters, social posts, forums, and search results. If checking requires copying text into several separate tools, the check often gets skipped.
Highlight
Select a claim from a webpage, then use the right-click workflow to start a check from the browser.
Review
Inspect verdict, confidence, reasoning, model agreement or disagreement, and source trail.
Decide
Use the result as a faster first pass, then slow down when sources are weak or context is missing.
More than a one-word verdict.
A useful fact-check should be inspectable. FactSentinel is designed to show the claim, the model reads, and the evidence trail so the answer can be challenged.
Evidence Trail
- Source links and citations
- Short reasoning
- Caveats when context is thin
Model Read
- Verdict and confidence
- Agreement or disagreement
- Signals to inspect manually
Workflow Fit
- Chrome extension
- Web checker fallback
- Optional Auto-Protection scans
Why useful AI fact-checking shows disagreement.
A confidence score can make an answer feel settled before the evidence is inspectable. Read the product principle behind FactSentinel's model split, caveats, and source-trail design.
Choose managed setup or BYOK control.
Platform mode is available for quick setup. BYOK is designed for users who prefer to use their own OpenAI or Anthropic provider keys and want more control over the request path.
Built for source-aware readers.
- Journalists checking fast-moving claims before publication.
- Editors and copyeditors reviewing AI-assisted copy, source claims, and draft assertions.
- Researchers reviewing source trails and model disagreement.
- Educators teaching verification habits and media literacy.
- Readers who want evidence before sharing a claim.
- Privacy-conscious users who prefer Bring Your Own Keys workflows.
Common questions
Is FactSentinel a replacement for professional fact-checkers?
No. FactSentinel is a first-pass checking workflow. It helps structure a claim, surface sources, and show model agreement or disagreement so a human reviewer can inspect the evidence.
Does FactSentinel only work on news articles?
No. You can check claims from articles, blogs, forums, newsletters, and many other web pages where you can select or copy text.
What does model agreement mean?
FactSentinel can compare independent model reads. Agreement can be useful, but it is not proof by itself. The sources and reasoning still matter.
What is BYOK?
BYOK means Bring Your Own Keys. It is designed for users who want more control over their AI provider credentials and request path.
Install FactSentinel for Chrome
Use the extension when you want fact-checking in the browser, or try the web checker first with a pasted claim.