Key points
- Detectors compare your text's statistical profile against patterns typical of AI and human writing.
- No detector claims 100% accuracy — most major tools publish documented false-positive rates.
- Longer documents generally produce more reliable scores than short passages.
AI detectors score writing for perplexity (word-choice predictability) and burstiness (sentence-length variation) rather than checking for a definitive 'AI signature.' Neither signal is proof of authorship on its own — both are statistical estimates trained on known AI and human writing samples.
What this means for you
Detectors compare your text's statistical profile against patterns typical of AI and human writing. Understanding this distinction is the foundation for evaluating any specific tool's marketing claims — see our full humanizer comparison table for how individual tools stack up.
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