QuillBotAI Pro — Free AI Content Detector for Educators & Publishers

QuillBotAI Pro detects text generated by ChatGPT, Gemini, Claude, and other models, including output that's been humanized or paraphrased to dodge simpler detectors, with sentence-level heatmap analysis and no signup required. Worth flagging clearly: the name closely echoes QuillBot but this is a separate, unofficial site — check you're actually looking for QuillBot's own detector if that's the specific product you want, since the naming similarity here looks deliberate.