AI Content Detector
Paste text to get a transparent, signal-by-signal estimate of how AI-generated it looks. No model guesswork hidden behind a single number — you see exactly which signals fired and why.
Read this first — AI detectors are not reliable evidence.
This is a statistical heuristic estimate, not proof. All AI detectors (including paid ones) produce false positives and false negatives — human writing is regularly flagged as AI, and edited AI text often passes. Do not use this tool to accuse a student, employee or writer of anything. Treat the result as one weak signal among many, never a verdict.
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Estimated likelihood
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Paste text above to begin.
Signal breakdown
AI Content Detector Examples
Click any card to tryHow to Use AI Text Detector
To analyse text for AI-generated characteristics, paste your content into the input area and click Analyse. The tool examines linguistic patterns including sentence structure uniformity, vocabulary diversity, perplexity, and burstiness — characteristics that distinguish human writing from AI-generated text.
The result shows an estimated probability that the text was AI-generated, along with highlighted passages and a breakdown of the signals detected. This tool provides a statistical estimate and should be used as one input among several when evaluating content authenticity.
Frequently Asked Questions
How does AI text detection work? expand_more
AI detectors measure statistical properties of text such as perplexity (predictability of word choices) and burstiness (variation in sentence length). AI-generated text tends to be highly predictable and consistent, while human writing shows more natural variation.
Is the result always accurate? expand_more
No. AI detection is a probabilistic analysis, not a definitive determination. Human text can sometimes be flagged as AI-generated, and sophisticated AI writing may score as human. Results should be interpreted as guidance, not proof.
What is perplexity in AI detection? expand_more
Perplexity measures how predictable each word is given the words before it. AI-generated text tends to have lower perplexity (each word is a highly predictable choice), whereas human writing shows greater unpredictability.
What is burstiness? expand_more
Burstiness measures the variation in sentence complexity and length. Human writers naturally vary sentence length and complexity, creating 'bursts'. AI-generated text tends to produce more uniform sentence structures with lower burstiness.
Can I use this tool to check student essays for AI use? expand_more
The tool provides a statistical likelihood estimate that can assist in evaluation, but results are not conclusive evidence. False positives are possible, so this should be used alongside other assessment methods.
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