The 41 tells
The design habits that give away a page an AI tool made and nobody decided. 32 are scored from the page’s code and styles; for the other 9, the scanner shows you what it found and you judge.
They come from Part 2 of the book Designed on Purpose, grouped by the part of the page they touch. Good sites made by people trip these too. The look is now common everywhere, which is rather the point.
The tells
About “reliable”. The figure is the share of past flags a person agreed with when checking pages by hand. 12 of the patterns have been checked that way so far, against 177 labelled sites from the original tool’s dataset. The others are newer and show “Not checked by hand yet” until they are. More on this.
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