🔍 Free AI Content Detector & Checker
Paste in a piece of writing and see, sentence by sentence, which parts read like AI wrote them — checked right in your browser, nothing you paste is ever saved or sent anywhere.
How Our In-Browser AI Detection Works
Commercial AI detectors (such as Turnitin, GPTZero, and CopyLeaks) do not have direct access to AI model training logs; they evaluate mathematical signals inherent in generative writing. Our tool inspects these exact statistical indicators directly inside your browser:
- Burstiness Variance: AI models write with metronomic consistency, typically generating sentences of 18–24 words with very low variance (standard deviation < 4.0). Human writers naturally interweave 4-word statements with 30-word compound thoughts (standard deviation > 7.0).
- Cliche Density & High-Probability Tokens: Matches against known token clusters common in Claude, ChatGPT, and Gemini completions (such as "delve into", "rich tapestry", "testament to", "pivotal role", and "at its core").
- Punctuation Entropy: Flags overused Claude parenthetical em-dashes (— like this —) and repetitive list structures.
- Contraction Deficits: Identifies formal text that artificially avoids common contractions ("it is", "cannot", "do not").
Everything runs entirely client-side in JavaScript. Your text is never uploaded to any remote server or third-party API, guaranteeing 100% confidentiality.
Frequently Asked Questions
How does this detect AI-generated text without calling an AI model?
It measures statistical writing patterns — sentence-length variation, common AI-writing phrases, punctuation habits, and token-level patterns — directly in your browser, rather than sending text to a language model to judge it.
Is the text I paste in uploaded or stored anywhere?
No — the entire analysis runs client-side in JavaScript. Nothing is sent to a server, and nothing is retained after you close the tab.
How accurate is the result?
It's a probability estimate based on writing-pattern heuristics, not a certainty — like any AI detector, it can be wrong in both directions, especially on short text or heavily edited AI output. Treat the sentence-by-sentence breakdown as a starting point for review, not a verdict.
What does the sentence-by-sentence highlighting show?
Each sentence is color-coded by its individual AI-likelihood score, and clicking one shows the specific signals behind that score (things like burstiness, token entropy, cliché phrases, or em-dash usage) — so you can see what's actually driving the overall result.
Can I fix a sentence flagged as AI-sounding?
Yes — a one-tap link sends the text over to the Humanize tool, which rewrites it to reduce the specific patterns this checker flags.