How we determine a fact score
Every Infact verdict comes with a number from 0 to 100. Here's how that number is built — the evidence behind it, what it means, and where it stops.
A fact score is an evidence-based estimate of how well a claim holds up — not a decree. We show our verdict, the sources behind it, and a confidence level so you can judge for yourself. We'd rather be honest about uncertainty than falsely certain.
From a claim to a score
Extract
We pull the specific, checkable claims out of your text, link, or image.
Gather evidence
We search independent web sources and professional fact-check databases.
Weigh signals
Multiple signals are combined — not a single opinion.
Score & calibrate
A 0–100 score is computed and tuned against real-world feedback.
Verdict
The score maps to a clear label, from True to False.
The four signals behind a score
No verdict rests on one source or a single model's guess. Each claim's score blends several independent signals, so one weak input can't swing the result on its own:
★Professional fact-checks
Ratings from established, independent fact-checking organizations when they've already examined a matching claim.
◎Web consensus
How strongly independent, reputable sources on the open web agree or disagree with the claim.
⚑Source quality
How credible and authoritative the supporting sources are — not just how many there are.
✦AI reasoning
A careful reading of the evidence that weighs context, nuance, and how directly the sources address the claim.
What the score means
Alongside the truth score, each check carries a confidence level — a separate measure of how certain the analysis is, based on how much clear, relevant evidence was available. High confidence and a high score is a strong verdict; low confidence signals "treat this as a lead, not a last word."
Built-in humility
No verdict without evidence
If we can't find independent evidence for a claim, we won't assert it's true — the score is held back to "Mixed."
Opinions aren't facts
Predictions and matters of opinion aren't scored as if they were verifiable facts.
Recency matters
Older fact-checks carry less weight over time, so a verdict reflects what's known now — not only what was true years ago.
We learn from feedback
When people consistently tell us a kind of verdict feels off, the system gently recalibrates toward reality.
Never 100% certain
Even a strongly-supported claim is never asserted at absolute certainty. Calibrated humility beats false confidence.
Deterministic, not a black box guess
The final score is computed by fixed rules from the evidence signals — the same inputs always produce the same score.
What a fact score is not
A high score means the available evidence supports the claim — not that it's eternally, unconditionally true. A low score means the evidence contradicts it as stated, which isn't the same as "the opposite is true."
Infact is a fast, evidence-based first pass, not a replacement for expert judgment on high-stakes decisions. When a claim is genuinely contested or evidence is scarce, we tell you so rather than manufacturing certainty. To keep the system honest and improving, the exact weightings, thresholds, and models behind the score are refined continuously — but the principles on this page don't change.
See it in action
Check any claim and you'll get the score, the verdict, and the evidence behind it.
