AI Content Detector
Paste any text and get a statistical likelihood score for whether it was written by AI. Analyzes sentence uniformity, AI vocabulary, transition word density, and more.
Signal Breakdown
Low variance in sentence length suggests AI (AI writes more uniformly).
Words and phrases statistically overrepresented in AI-generated text.
Heavy use of formal connectives like "furthermore" and "moreover".
Avg words per sentence. AI tends toward longer, complete sentences.
Detected AI Terms
About the AI Content Detector
Inspect English writing patterns including sentence-length variation, selected vocabulary and transitions. This browser tool combines four heuristics into a score and lists the matching terms. A score is not a calibrated probability of AI authorship and cannot prove who wrote a text. Use it to inspect style, not as evidence for an accusation or an automated grading decision. Analysis begins after at least 50 words.
Features
- Four signal breakdown: sentence uniformity, AI vocabulary, formal transitions, sentence length
- Lists detected AI vocabulary terms with occurrence counts
- Debounce-triggered analysis — updates as you type
- 100% private — no text is uploaded, no API is called
- Heuristic writing-pattern score from 0 to 100
- Requires at least 50 words before showing a score
How to use this tool
The AI Content Detector works right in your browser — no signup, no installation. Follow these steps:
- Paste the text you want to check into the input box (minimum 50 words).
- The detector analyzes the text automatically and shows an overall likelihood score.
- Review the four signal bars to see which patterns contributed to the score.
- Check the "Detected AI Terms" list to see which specific words or phrases were flagged.
Frequently asked questions
How accurate is this detector?
It uses statistical heuristics rather than a trained ML model, so it is not 100% accurate. It works well as a quick first-pass check, especially for generic or template-heavy AI outputs. Highly polished or edited AI text may score low; unusual human writing styles may score high. Do not use it as definitive proof either way.
What does the Sentence Uniformity signal measure?
AI models tend to generate sentences of similar length — the coefficient of variation (stdev ÷ mean) across sentence lengths is low. Human writers naturally vary sentence length more, resulting in a higher coefficient of variation. Low uniformity → high AI score.
Which words count as "AI vocabulary"?
A curated list of words and phrases statistically overrepresented in AI-generated text: single words like "delve", "tapestry", "transformative", "seamlessly", and "nuanced", plus multi-word phrases like "in today's digital landscape", "it's worth noting", and "comprehensive overview".
Why does it need at least 50 words?
Statistical signals like sentence-length variance and vocabulary density are not reliable on very short texts. With fewer than 50 words, a single unusual sentence can wildly skew the burstiness score, making the result meaningless.
Is my text sent to a server?
No. All analysis runs locally in your browser using JavaScript. Your text is never uploaded, logged, or stored.
Is this tool free to use?
Yes, completely free with no signup, no limits, and no usage tracking.
Using the results
Good analysis needs to be both fast and private. The AI Content Detector processes your text locally and shows results as you work, so you can iterate on drafts and data freely, knowing the content is never transmitted or stored.