Grammarly uses artificial intelligence, but using Grammarly does not automatically make your writing AI-generated. The result depends on which features you use. Basic spelling, grammar, and punctuation corrections are different from features that generate new content or rewrite entire paragraphs.
This difference matters when students submit assignments, writers prepare articles, or professionals edit documents. Some AI detectors may flag text that has been rewritten by generative AI, while basic grammar corrections are generally less likely to trigger an AI flag.
In this guide, you’ll learn which Grammarly features may be flagged, how Turnitin and other AI detectors assess edited text, and how to check your writing before submitting it.
Does Grammarly Count as AI?
Grammarly counts as an AI-powered writing tool, but not every feature produces AI-generated content. The platform uses AI to suggest corrections and improve writing, while its generative features can create or substantially rewrite text.
According to Grammarly’s official explanation, the product uses two broad types of AI assistance.
1. Traditional Grammar and Writing Suggestions
Grammarly’s foundational AI helps users correct spelling, grammar, punctuation, clarity, and word choice. These suggestions generally work with writing that the user has already created.
For example, Grammarly might correct this sentence:
Original: She dont understand the instructions.
Corrected: She doesn’t understand the instructions.
The correction fixes a grammatical error without creating a new argument or changing the main idea. This type of editing is generally treated differently from generating a paragraph with AI.
2. Generative AI Features
Grammarly also offers generative features that can draft, rewrite, summarize, and change the tone of text. These features can produce new wording and make larger changes to the original content.
For example, a student might write a basic introduction and ask Grammarly to rewrite it in a more academic style. If the tool replaces much of the original wording, the result contains text generated by AI.
The key difference is the amount and type of work the tool performs. Correcting a comma is not the same as asking AI to write an entire paragraph.
Does Grammarly Premium Count as AI?
Grammarly Premium is not automatically considered AI-generated writing. Its editing features can help improve text that you have written yourself. However, paid access may include additional rewriting and generative capabilities. Using those features to produce new wording is different from accepting basic grammar corrections.
The same distinction applies to free and paid accounts: the feature you use matters more than the plan you have. Always check which capabilities are enabled and what your school or organization permits.
Can Turnitin Detect Grammarly?
Turnitin can flag text produced by Grammarly’s generative AI features, but basic grammar corrections are generally less likely to be flagged.
Turnitin explains this distinction in its AI writing detection guidance. Its detector is not designed to target ordinary spelling, grammar, and punctuation changes made by Grammarly. Turnitin also states that text produced by Grammarly’s generative features, including drafting, paraphrasing, and summarizing, will likely be flagged as AI-generated.
However, Turnitin does not guarantee that every grammar-edited document will receive a zero AI score.
What Does a Turnitin AI Score Mean?
Turnitin’s AI Writing Report estimates how much qualifying text may have been generated by AI. It highlights passages that its model identifies as potentially AI-generated or AI-modified.
The score does not prove that a student cheated, identify every tool used, or establish whether a particular use of AI broke an academic rule.
Turnitin also separates its AI Writing Report from its Similarity Report:
- AI Writing Report: Estimates whether qualifying text may have been generated or modified by AI.
- Similarity Report: Identifies text that matches material in sources such as websites, publications, and student papers. To check text that matches existing sources yourself, run it through a plagiarism checker before submitting.
A document can have a high similarity score without being AI-generated. It can also receive an AI flag without containing copied text.
For this reason, teachers should consider the report alongside the assignment instructions, the student’s writing process, and other relevant evidence.
Why Can Grammarly-Edited Text Be Flagged as AI?
Grammarly-edited text can be flagged when its language patterns resemble those commonly associated with AI-generated writing. This can happen even when the original ideas and most of the writing came from a person.
AI detectors examine patterns across text instead of checking whether someone clicked a specific Grammarly button.
1. Generative Features Change the Original Wording
When Grammarly rewrites a sentence or paragraph, it may replace the writer’s original phrasing with new text. If the new wording resembles patterns in AI-generated writing, a detector may flag it.
The amount of rewriting can matter. Correcting a spelling mistake makes a small change, while replacing several paragraphs can significantly alter the final text.
2. Formal Writing Can Resemble AI Output
Human writers often use clear transitions, consistent grammar, and formal sentence structures. AI-generated text can share these characteristics.
As a result, polished academic writing may sometimes receive an AI flag even when a person wrote it. This is one reason detector results need careful interpretation.
3. Different Detectors Produce Different Results
AI detectors use different models, training data, and classification methods. A passage that receives a low AI score from one tool may receive a higher score from another.
A 2025 study by Bordalejo and colleagues highlighted the difficulty of distinguishing AI-generated text from writing modified by AI-assisted tools. The study supports a cautious approach to detection, not the assumption that every Grammarly edit will trigger a flag.
For a closer look at why this happens, read CudekAI’s guide to AI Detector False Positives.
How to Check Grammarly-Edited Text Before Submitting
You can review your Grammarly-edited text before submitting it, but no detector can guarantee how another tool will classify the same document.
A careful review helps you understand whether the text may need further attention and whether your writing still reflects your own ideas.
Step 1: Review Your Grammarly Changes
Read the final document and compare it with your original draft. Check which suggestions corrected errors and which ones changed entire sentences or paragraphs.
Pay particular attention to text rewritten by generative AI features. Make sure the final wording accurately reflects what you intended to say.
Step 2: Check Your Text With an AI Detector
Use the CudekAI AI Detector to review your Grammarly-edited text. The tool analyzes writing patterns and provides an AI classification to help you identify passages that may need closer review.
The result can offer useful feedback, but it cannot guarantee the result you would receive from Turnitin or another detector. Different tools may produce different scores.
If the detector flags a passage you wrote yourself, review the original draft and your editing history before drawing conclusions. Do not assume that a high score proves the passage was generated by AI.
Step 3: Check Grammar Separately
An AI detector and a grammar checker serve different purposes. An AI detector estimates whether text resembles AI-generated writing, while a grammar checker identifies language errors and suggests corrections.
CudekAI’s Grammar Checker can help you review spelling, punctuation, and sentence clarity. Using a grammar checker does not replace reviewing your content for accuracy, originality, and appropriate source attribution.
Step 4: Keep Your Original Drafts
Save your early drafts and review the changes you make throughout the writing process. Version history can help demonstrate how your document developed over time.
For example, an original outline, research notes, and successive drafts may help explain how you developed your argument. These records are especially useful if someone questions whether you wrote the work yourself.
Step 5: Follow Your School’s AI Policy
Check your assignment instructions before using Grammarly’s generative features. Some instructors allow grammar corrections but restrict AI rewriting, while others require students to disclose certain types of AI assistance.
If the rules are unclear, ask your instructor before submitting the assignment. A detector score cannot tell you whether your use of Grammarly was permitted.
Students who want more guidance can also read CudekAI’s article on How to Use AI to Study Without Cheating.
Grammarly vs. Turnitin vs. CudekAI: What Is the Difference?
These tools support different parts of the writing and review process. Understanding their roles helps you choose the right one for your needs.
Grammarly: Writing and Editing Assistance
Grammarly helps users improve spelling, grammar, punctuation, clarity, and tone. Its generative features can also create or rewrite content.
Grammarly is primarily a writing assistant, although it offers AI detection features in some products and plans. Its corrections and generative writing capabilities should not be treated as the same type of assistance.
Turnitin: Academic Writing Review
Turnitin offers educators tools for reviewing text similarity and estimating whether qualifying text may have been generated by AI.
Its AI Writing Report is intended to support an instructor’s review, not replace human judgment. Access to reports and features depends on the institution’s Turnitin setup.
CudekAI: AI Detection and Grammar Checking
CudekAI offers separate tools for reviewing AI-generated writing and checking grammar. The AI Detector estimates whether text resembles AI-generated content, while the Grammar Checker focuses on language errors and readability.
These tools can help writers review their work before submission. However, neither tool can guarantee that Turnitin will return the same result or that an institution will consider a particular use of AI acceptable.
The best approach is to use each tool for its intended purpose: improve the writing, review potential AI signals, and follow the rules that apply to the work.
Final Thoughts
Grammarly does use AI, but basic grammar corrections are different from AI-generated writing. Correcting spelling and punctuation is generally less likely to trigger an AI flag, while using generative features to draft or rewrite paragraphs may increase the chance of detection.
Turnitin and other AI detectors can help identify text that resembles AI-generated writing, but their results are not perfect. A flag does not prove misconduct, and a low score does not guarantee that text will pass every detector.
If you use Grammarly, review the changes carefully, keep your original drafts, and check your institution’s AI policy. CudekAI’s AI Detector can provide an additional review of your text, while its Grammar Checker can help you identify language issues before submitting your work.
The goal is not simply to receive a low AI score. It is to produce clear, accurate writing that reflects your own understanding and follows the rules for your assignment.
FAQs
1. Does Grammarly count as AI writing?
Grammarly is an AI-powered writing tool, but using it does not automatically make your work AI-generated. Basic grammar and spelling corrections are different from generative features that create or rewrite text.
2. Can Turnitin detect Grammarly Premium?
Turnitin may flag text produced by Grammarly Premium’s generative features, including paragraph rewriting and summarization. Basic grammar corrections are generally less likely to be flagged. The result depends on the text and the detection model.
3. Does Grammarly’s free version trigger AI detection?
Grammarly’s free version can include both basic editing suggestions and generative AI capabilities. Basic corrections are generally less likely to trigger an AI flag, while text produced through generative features may be flagged.
4. Can Grammarly make human-written text look AI-generated?
Yes. Generative rewriting can change human-written text, and even basic writing assistance may sometimes affect detector results. AI detectors can also flag original human writing because their classifications are based on patterns rather than direct proof of authorship.
5. Is using Grammarly considered cheating in college?
Using Grammarly is not automatically cheating. Many instructors allow spelling and grammar corrections, but some restrict AI rewriting or require students to disclose generative AI assistance. Always follow the policy for your course and assignment.
6. How can I check if Grammarly-edited text will be flagged as AI?
You can review your text with an AI detector such as CudekAI’s AI Detector. The result can help identify passages that deserve closer review, but it cannot guarantee what Turnitin or another detector will report. Keep your original drafts and follow your institution’s AI policy.