Artificial Intelligence

Does Copyleaks Detect Grammarly As AI? The Truth Revealed!

06/29/2025
by Zoran Trimmel
Heads up! The article includes affiliate links. If you click and purchase, we may receive an affiliate commission at no extra cost to you. Check our Affiliate Disclaimer.

You’re using Grammarly to clean up your writing and worry, “Does Copyleaks detect Grammarly as AI?” Then, you’ve come to the right place to find an answer.

Known for its strict and highly accurate AI content detection, Copyleaks is like a big barrier to surpass. So now, let’s see how this platform handles pieces of writing that are twisted by Grammarly, as well as getting to know some tried-and-true tips to get over those detections.

Does Copyleaks detect Grammarly as AI?

Yes, Copyleaks can flag Grammarly when there are touches of generative AI tools like GrammarlyGo’s “Improve” or “Rewrite” options. However, Copyleaks doesn’t spot Grammarly as AI when you just use basic editing features like grammar, spelling, or clarity adjustments. In short, it depends on “To what extent is Grammarly used?”.

In fact, Copyleaks ran a large test, running 1,000 human-written essays, to check how writing assistant tools affect AI detection. The test has led to the conclusion as above, along with a statistic that 31.6% of cases using GrammarlyGo’s generative AI features were detected.

So that’s what the platform found and claimed. Here, we’ve conducted a mini-test to further prove it.

First, we took a block of text from a human-written post and had Grammarly fix its tone and grammar.

Using Grammarly to Improve Grammar and Sentence Structure

Using Grammarly to Improve Grammar and Sentence Structure

As we accepted appropriate suggestions, we got a new version of our text. Then, we checked it with Copyleaks. Result? 0% AI detected.

Grammar-Edited Text Could Bypass Copyleaks

Grammar-Edited Text Could Bypass Copyleaks

Next, we moved to the second test. This time, Grammarly helped us improve the text by making it empathetic.

Using Grammarly’s Gen AI to Improve Text

Using Grammarly’s Gen AI to Improve Text

Now, let’s see if this improved text was flagged by Copyleaks:

Copyleaks Flags the Improved Version by Grammarly Gen AI

Copyleaks Flags the Improved Version by Grammarly Gen AI

Well, the whole text was detected to be AI-written. Quite risky, isn’t it? However, when we asked Grammarly to change just a part of our text, it appeared to bypass Copyleaks.

Part of The Text Improved by Grammarly

Part of The Text Improved by Grammarly

Partly-Improved Text Can Bypass Copyleaks

Partly-Improved Text Can Bypass Copyleaks

So, just like the reference study, while the traditional editing version of Grammarly is safe from Copyleaks detection, its genAI edits might get flagged. For the latter case, we’ve got ways to recover (which we’ll discuss later in this post).

You may be interested in:

Can Copyleaks detect Quillbot? Facts You Should Know!

Does Turnitin Detect Grammarly As AI? The Final Answer [Update 2025]

How does Grammarly Paraphrase Text?

Grammarly uses two types of tools:

The basic ones, which have been familiar to writers for ages, focus on making small changes. For instance, we usually use them to check grammar, swap words, adjust tone, and more. As basic as they are, the outputs still sound like you.

The advanced one, GrammarlyGo (a kind of generative AI), is beyond traditional. It can help rewrite whole sentences using large language models. So, with this feature, while you can accelerate your writing process, the outputs may appear AI-generated to detectors.

How Does Copyleaks Detect Paraphrasing Text?

Copyleaks checks for AI-rephrased texts in a few ways as follows:

  • Semantic changes: If a sentence is rewritten but still conveys the same idea, Copyleaks can raise a red flag.
  • Deep learning models: These models are trained on large datasets of paraphrased and original texts, helping Copyleaks to compare sentence structure and grammar patterns as well as recognize synonym swaps, sentence reordering, and more.\
  • Style and pattern analysis: AI text often has a consistent tone and rhythm, and Copyleaks can recognize this feature.
  • Fuzzy matching: Copyleaks applies this technique to catch near-duplicates even after small modifications

In Grammarly’s case, genAI outputs tend to have a lower similarity score, meaning they look more like something fully rewritten and are more likely to be flagged.

You may be interested in: How to Reduce Similarity Score On Turnitin? 7 Tips To Reduce

How to Use Grammarly Effectively While Avoiding AI Detection?

Alright, now that Grammarly is on the edge of being flagged, let’s find solutions to get its benefits without AI worries. Here are some helpful tips to follow:

  • Use grammar, clarity, and tone tools, and avoid relying on features like GrammarlyGo’s “Improve” or “Rewrite” for the entire text without proofreading.
  • Edit manually after using Grammarly. This is because human touches are still essential. Any attempt to rephrase or change the sentence structure helps keep things human.
  • Keep your voice. You might notice this or not, but not all of Grammarly’s suggestions are appropriate. So, accept them where necessary and stick to your own writing style.
  • Run content through AI detection tools before submitting or publishing. Well, we might all agree that Copyleaks or its alternatives, like Originality AI and Winston AI are reliable enough to examine your writing. So, don’t miss this important last check.
Originality AI as a Great Copyleaks Alternative

Originality AI as a Great Copyleaks Alternative

 

 

Wrap it up

Now, the answer to the big question, “Does Copyleaks detect Grammarly as AI?” is revealed. In a nutshell, Grammarly may not be a threat to AI detection as long as it is used in a smart way. Remember to follow the tips we shared above to let your work stay clean, human, and high-quality.

Are you fond of exploring any other rephrasing tools or AI detectors? Give us a name, and we’ll give you the latest insights!

FAQs


1. Will Grammarly get flagged as AI?

Yes, if you use GrammarlyGo, which generates or rewrites full sentences, it may be flagged by AI detectors. However, using Grammarly for standard grammar or punctuation corrections is safe from detection.

2. Does Copyleaks flag Grammarly?

Yes, Copyleaks can flag text improved by GrammarlyGo, especially if there’s noticeable semantic or structural rewording. Meanwhile, simple grammar edits usually don’t get flagged.

3. Is Grammarly AI detection as good as Turnitin?

No, Grammarly’s AI detection isn’t as strong as Turnitin’s. Turnitin uses more advanced models trained on academic writing and is better at identifying AI-generated content.

Rating
5/5
Zoran Trimmel
Zoran Trimmel
Zoran Trimmel is an AI specialist who simplifies complex technical concepts. He evaluates emerging AI platforms for our technology website and produces insightful articles on AI and tech tools, thanks to his attention to detail and effective communication skills.
Help you
with any question!