What is the best AI fact checker?
The best AI fact checkers in 2026 are Hobnob AI (TruthScore on every source), Perplexity, Originality.ai (for AI-written content detection), and Google Fact Check Explorer. For real claims, only tools that cite live web sources can fact-check — chat models without web access cannot.
AI fact checkers fall into two groups: claim verifiers (compare a statement against the live web) and AI-content detectors (was this written by AI). Most useful is a tool that does both — Hobnob AI's TruthScore is built for exactly this.
How AI fact checking actually works
A good fact checker takes your claim, searches the live web for primary sources, compares them, and flags contradictions. ChatGPT and Claude without web search can't do this — they only know their training data. Always use a web-grounded tool.
Top tools in 2026
Hobnob AI (TruthScore 0–100 on every source, freshness + AI-likelihood scoring, free unlimited), Perplexity (cited web search, 5 Pro/day free), Originality.ai (best for detecting AI-written articles — paid), Google Fact Check Explorer (free, but limited to ClaimReview-tagged content).
How to fact-check a viral claim
1) Paste the claim into Hobnob AI with Expert-Only filter on. 2) Check the TruthScore of every citation — anything below 60 needs further verification. 3) Look for primary sources (.gov, .edu, peer-reviewed) before secondary blogs. 4) If sources contradict each other, the claim is unsettled, not 'false'.
Detecting AI-written content
Originality.ai and GPTZero lead for AI-detection — but both have false-positive rates near 10%. Don't accuse anyone based on a single tool. Hobnob's TruthScore includes an AI-likelihood signal for source pages, which is more useful for filtering search results than judging individual essays.
Frequently asked questions
Can ChatGPT fact-check claims?
Only in ChatGPT Search mode. By default it uses 2023 training data and will confidently confirm false claims. For reliable fact-checking always use a web-grounded tool like Hobnob AI or Perplexity.
Is Hobnob AI's TruthScore reliable?
TruthScore combines domain authority (Tranco), freshness (publish date), and AI-likelihood signals (writing patterns + known AI farm domain list). It's a signal, not a verdict — use it to prioritise which sources to click first.
What's the best free AI fact checker?
Hobnob AI Free covers unlimited cited fact-checking with TruthScore. For ClaimReview-tagged claims (politics, viral news), pair it with Google Fact Check Explorer.
Can AI detect deepfakes?
Not via text fact checking. For images use AI or Not, Hive, Sensity. For video use Reality Defender. None are perfect — always cross-check against the original source.
Try it on Hobnob AI
Cited answers, TrustScore on every source, free to start.
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