LLM-Assisted Proofreading A Study of the Effectiveness of 13 Free AI Detection Tools

Published on July 24, 2026 10:11 AM GMTA short one today.I applied to a fellowship last year, used an LLM to check my punctuation - wrote the disclaimer prominently as required - and later discovered the same text scored between 40% and 100% AI-generated on free detection tools.I didn’t let it go. When have I ever?So, I tested 13 free AI detection tools on seven human-written texts at four levels of LLM-assisted proofreading from three LLMs (wiping sweat of forehead).The result: a published pape...