I installed one of these myself recently, and it’s been pretty interesting to see which sites might use AI-generated text. It’s not a guarantee that they’re AI-generated of course, but it definitely helps to make me think twice.
Firefox:
- https://addons.mozilla.org/en-US/firefox/addon/em-dash-detector/
- https://addons.mozilla.org/en-US/firefox/addon/em-dash-highlighter/
Chrome:


I agree, there are legitimate writers who use em dashes often, but I think this tool also helps you distinguish those from AI-generated content. There’s a different quality in the way AI generated text uses the em-dash. Often the ratio of em-dashes to the rest of the text is much higher, and it’s usually used to complete a point, as opposed to an interjection like you just did in your comment. I think that’s easy to spot when you know to look for it.