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Paste a chapter, an essay, an email. The checker counts the patterns readers recognise as machine prose, per thousand words, and shows you the exact sentences. Nothing is uploaded.
Want the fixes done for you? Neubook Write interviews you, plans the book with you, and line-edits every chapter against these same rules. The guide explains what moved the numbers.
Read the guide Build a book, freeNo. Detectors guess whether a machine wrote a text and are wrong often enough to be dangerous. This counts specific, visible patterns that readers associate with machine prose, and shows you the sentences. A human can write with these tics; a model can be edited out of them.
Below 15 reads as a person. 15 to 35 has a few tics worth fixing. Above 35 has the clustering readers notice. Scores are per thousand words, so a long text is judged by rate, not by count.
Nowhere. The checker runs entirely in your browser; nothing is uploaded.
Reversals and "You" openers, then chapter or section endings that summarise, then bold inside paragraphs. Cadence is the hardest: vary sentence and paragraph length on purpose.