QuillBot’s AI detector is moderately accurate but not fully reliable. It can sometimes flag human-written text as AI or miss AI-generated content. Like most detectors, it should be used only as a guideline, not a definitive assessment.
Here’s how QuillBot AI Detector performs — in brief, with strengths and caveats:
For straightforward AI-generated text (e.g. full output from a model without edits), QuillBot flags it reliably — many tests show ≈ 85–95% accuracy.
Accuracy drops with paraphrased, edited, or hybrid (AI + human) writing — such content may evade detection or be mis-classified.
False positives occur: some purely human-written content (especially formal or academic style) gets flagged as “AI-generated.”
It’s fast and user-friendly, good for quick checks or rough screening.
Not ideal when stakes are high (e.g. academic integrity, publishing) — results should be combined with manual review or multiple tools for better reliability
