I don't know if anyone mentioned before, but there are more tools similar like this one.
Problem is that they can all give different detection results and they are not very reliable for this purpose.
I even saw one of this tools detective that US constitution was AI generated text, something that was written hundreds of years ago

Anyway, here are few more tools I found and bookmarked:

Draft & Goal ChatGPT - GPT3 Content Detector (Minimum 400 characters):
https://detector.dng.ai/

GPT-2 Output Detector Demo:
https://openai-openai-detector.hf.space/

Detecting GPT-2 Generations with DetectGPT:
https://detectgpt.ericmitchell.ai/


^{PS
Don't submit any sensitive or private information to any of this detectors.}