Most "is this AI-written" tools give you a single number and nothing else, which makes the number useless the moment you disagree with it. LoupeKit's click-a-finding-and-it-scrolls-to-the-element approach fixes that - every part of the score is something you can actually go look at, not just a verdict you have to take on faith. Ran it on a couple of pages I know well and the heuristics it flagged (repeated markup blocks, thin copy) matched what I'd have flagged manually.