https://www.theguardian.com/technology/2023/jan/12/college-student-claims-app-can-detect-essays-written-by-chatbot-chatgpt

Princeton senior Edward Tian says GPTZero can root out text composed by the controversial AI bot, but users cite mixed results

A 22-year-old college student has developed an app which he claims can detect whether text is written by ChatGPT, the explosive chatbot raising fears of plagiarism in academia.