Yesterday I shipped a free detector for the 12 most reliable AI writing fingerprints. The story behind it: my reddit account got 2 public "all comments are AI generated" callouts in one day. Mods removed 3 posts. I was running everything through Claude. The em-dashes and "delve" gave me away in seconds.

Detector traction was fine. 100+ scans day one, sat at 12 page views from a Dev.to post overnight. But every single piece of feedback I got was the same: "ok cool, now how do I fix it without rewriting by hand every time?"

So I shipped the rewriter today.

→ https://aitells.vercel.app/rewrite

what it does, technically

You paste two things:

Your AI-generated text (the thing you would post)

1-3 writing samples of how you actually write (old reddit comments, tweets, emails)

The endpoint sends both to Claude with a strict system prompt that hard-bans em-dashes, "delve", "tapestry", "navigate the X", "in conclusion", "however,", parallel bullet structure, uniform sentence length, and 9 other patterns from…