Detect tower · floor
Copyleaks: the detector inside your LMS
copyleaks is the detector most people meet without visiting its website. It plugs into the learning platforms universities already run, which means the first time many students encounter it is inside a result.
It also publishes something the others do not, and it belongs at the top of this floor rather than buried in a features list.
Copyleaks, on its own AI detector page, read 21 August 2026. That is a detector company telling you that one of the most widely installed writing tools in
the world can cause your own writing to be flagged. It is not a fringe claim either: a competing
detector, Originality AI, states separately that it “actively tests AI tools that change, modify,
or edit text (e.g. Quillbot or Grammarly)” in order to keep detecting them.The warning worth reading before anything else here
“For writers and students, certain platforms, like Grammarly, use ChatGPT and other
genAI models for key functionalities and can be flagged as potential AI content.”
Set that against the arithmetic on the rest of this tower and a picture emerges that nobody selling these tools states in one sentence: the writing most likely to be flagged is careful, plain, edited prose — which is exactly what a student is told to produce.
“Over 99% accuracy, even when it’s carefully blended with human writing”, across “over 30
supported languages”, and “low false-positive rates for non-native English text”. The company lists integrations with Canvas, D2L, Moodle, Blackboard, Schoology, Edsby and
Sakai — which is how most students meet it, without choosing it. “AI Logic demystifies detection by showing you why text has been flagged”, through AI Phrases
and AI Source Match — unusual, because most detectors show only a number. The company advertises scanning “up to 25,000 characters without logging in, a higher limit
than most major AI detection tools”.
One consequence deserves stating on its own, because it is the practical upshot of this whole tower. If two competing detector companies both say that mainstream editing tools change how text scores, then a detector result is not measuring whether a person wrote something. It is measuring how closely the finished text resembles the statistical middle — and careful editing moves writing toward that middle by design. That is not a defect anybody is hiding; it is what the technology does, described by the people selling it.
Where to start
Five ways in.
- “I use Grammarly. Am I at risk?”
- Start at the grammarly problem
- “My university uses this and I was flagged.”
- Go to if it flagged you
- “What does Copyleaks claim about itself?”
- That is what it claims
- “I write in more than one language.”
- Read what it claims
- “I want to check my own work first.”
- That is using it yourself
The Grammarly problem
Two competing detector companies say, independently, that mainstream editing tools interfere with detection. That has consequences for millions of people who did nothing wrong.
What it claims
Quoted from the company, with the date. Claims are described here rather than judged, because judging them needs a controlled test we have not run.
If it flagged you
The practical wing. Most people reading this arrived through a learning platform, not through a search for a product.
Using it yourself
Checking your own work before somebody else does. Free, within limits, and worth understanding before you rely on the number.
What this tower will not do
It will not tell you Copyleaks is accurate or inaccurate. The company publishes a figure; verifying it needs a controlled test with texts we wrote ourselves, and until that exists there is no verdict here.
It will not tell you to stop using a grammar checker. Two detector companies say editing tools interfere with detection, and the answer to that is not to write worse — it is to keep the record of how you wrote.
And it will not pretend the choice was yours. Most people meet this detector because an institution installed it, which is precisely why what it says about itself should be public and quoted rather than left in a marketing page nobody reads. What holds instead is simple: every claim here is quoted from the company that published it, with the date it was read.
Where this page got its facts
- Copyleaks’ own AI detector page — the Grammarly warning, the accuracy and language claims, AI Logic, the LMS integrations and the free scan limit — copyleaks.com, read 21 August 2026.
- Originality AI’s statement that it actively tests tools which modify text, naming QuillBot and Grammarly — originality.ai, read 21 August 2026.
Written by Alberto Gulotta
Founder and editor of AI Tools Primer, writing from Palermo, Italy. Thirty-five years of taking computers apart, starting with a Commodore 64 — the long version is on the about page.
Something wrong on this page? Write to aitoolsprimer@gmail.com and it gets fixed.
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