DetectGPT

What it does

DetectGPT checks text to show whether it looks human written or AI generated. It says it is trained on billions of words and works with models such as ChatGPT, GPT-4 and Gemini. It offers a plagiarism checker, fact checking, a readability score and human-written certificates.

DetectGPT is a web tool for checking whether text looks human written or AI generated. You paste up to 5,000 characters or upload a file, and it returns a probability score such as 80% AI generated or 15% mixed. The site says it is trained on billions of words and works with models including ChatGPT, GPT-4 and Gemini. It also lists a plagiarism checker, fact checking, a readability score and human-written certificates. Paid plans start at $15 per month for 50,000 words, with higher tiers for more words and team seats. A free trial gives 3,000 words. An API is offered for organizations that want to add detection to their own tools. AI image detection is listed as coming soon. Treat any single score as a signal, not proof.