I edit for a living and Grammarly has been running in my browser for years, mostly for typos in client copy. A client just forwarded me a note from their teacher friend saying "Grammarly can tell if something was written by AI now," and asked whether I could run their newsletter through it before it goes out. I opened the Grammarly menu and I can see something called AI Detector next to the plagiarism checker, but I honestly do not know what it is. Is it a real detector or a marketing label on the grammar engine? Does it do the same thing as Turnitin, or is it a separate model? And if a piece of my own writing comes back with a high percentage, what does that number actually mean? I am on a Windows laptop with the Grammarly desktop app plus the Chrome extension, free plan on one account and a paid one through the client. I do not want to hand clients a percentage I cannot explain.

Yes, it exists as its own tool, separate from the grammar checks. You paste text or upload a file and it gives you a percentage. Whether you should hand that number to a client is a different question, and I would say no unless you can explain what it measures.

Does Grammarly have an AI detector, and is it the same one my professor uses?

Asked by Petra D. · Nov 13, 2026AI tools and detectors 1 replyupdated Nov 13, 2026

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I edit for a living and Grammarly has been running in my browser for years, mostly for typos in client copy. A client just forwarded me a note from their teacher friend saying "Grammarly can tell if something was written by AI now," and asked whether I could run their newsletter through it before it goes out.

Written by Petra D. · Nov 13, 2026

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Geek With Laptop Forum, "Does Grammarly have an AI detector, and is it the same one my professor uses?", https://geekwithlaptop.com/forum/thread/does-grammarly-have-an-ai-detector-and-is-it-the-same-one-my-professor/, accessed 2026-11-14.

Petra D.
Member · Nov 13, 2026

I opened the Grammarly menu and I can see something called AI Detector next to the plagiarism checker, but I honestly do not know what it is. Is it a real detector or a marketing label on the grammar engine? Does it do the same thing as Turnitin, or is it a separate model? And if a piece of my own writing comes back with a high percentage, what does that number actually mean?

I am on a Windows laptop with the Grammarly desktop app plus the Chrome extension, free plan on one account and a paid one through the client. I do not want to hand clients a percentage I cannot explain.
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Raul M.Member · Nov 13, 2026
Yes, it exists as its own tool, separate from the grammar checks. You paste text or upload a file and it gives you a percentage. Whether you should hand that number to a client is a different question, and I would say no unless you can explain what it measures.
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