Does Grammarly count as AI?
It depends on which part of Grammarly you use. Spelling, grammar and punctuation fixes are editing help, much like a spell checker, and Turnitin staff said early tests found them generally not flagged. Grammarly's generative features, which write or rewrite sentences from a prompt, are generative AI: they can be flagged and they fall under your school's AI rules.
The question comes up because "Grammarly" now means two different things. One is the grammar checker people have used for years. The other is a set of generative tools that can draft, rewrite, shorten or change the tone of whole paragraphs. A teacher who says "no AI" almost never means "no spell check", but they very often mean "no rewriting tool". Knowing which side of that line each feature sits on clears up most of the worry.
Which Grammarly features count as AI?
All of Grammarly runs on machine learning, so in a technical sense it's all "AI". That isn't the useful question. The useful one is whether a feature writes words for you or corrects words you wrote. Grammarly itself draws the same line: its support pages describe the core suggestions as improving writing without changing its substance, and describe the generative features as optional, off by default and available on demand (Grammarly support, checked October 2026).
| What you use | What it does | Counts as generative AI? | Detector risk |
|---|---|---|---|
| Spelling and grammar fixes | Corrects errors in your sentences | No | Low |
| Punctuation, word choice, conciseness tips | Small edits you accept one at a time | No | Low, rising if you accept dozens |
| Sentence or paragraph rewrites | Replaces your wording with new wording | Usually yes | Medium to high |
| Prompted drafting (launched as GrammarlyGO) | Writes new text from an instruction | Yes | High |
| Grammarly's AI humanizer | Rewrites text in a new style | Yes | Depends on the detector |
Feature names change often, so judge each one by what it does to your text, not by what it's called. If the words on the page came from Grammarly rather than from you, treat that feature as generative AI.
Does Grammarly get flagged as AI by Turnitin?
For ordinary corrections, usually not. When Turnitin launched its AI writing detector in 2023, instructors asked about Grammarly on Turnitin's own community forum. A Turnitin staff member replied that the detector was tuned to target content written by large language models such as GPT-3.5, not Grammarly corrections, and that in initial tests on human-written documents, changes made by Grammarly's free and premium checks were generally not flagged. The same thread said text produced with GrammarlyGO, the generative tool, would likely be flagged (Turnitin community thread).
Two caveats. First, that was early testing on an earlier version of both products. Detectors are retrained and Grammarly's features change, so treat it as a guide, not a guarantee. Second, "generally not flagged" is not "never". Every detector makes mistakes on some fully human writing. Research has found that writing by non-native English speakers is flagged far more often than writing by native speakers (Liang et al., 2023). If you're worried about a false flag, our guide to how to prove you didn't use AI covers what to do.
Why can heavy Grammarly use look like AI?
AI detectors look for text that's statistically predictable: even sentence lengths, common word choices, smooth transitions and few surprises. A grammar fix to one word doesn't change much. But accept every "clarity" and "conciseness" suggestion across an essay, and your quirks get sanded off one by one until the text reads like everyone else's. Rewrite tools go further, because they swap your sentences for the most likely phrasing, which is exactly what detectors are built to notice.
So the practical rule is simple: the more of the wording a tool chose, the more the result reads like machine writing. Fixing a comma is fine. Accepting a full-paragraph rewrite is a different thing. If you want to see which of your own sentences read flat, our guide to whether your writing sounds like AI has a five-minute self-check.
Does using Grammarly count as cheating?
Spell-checking and fixing grammar in work you wrote yourself is almost never cheating. Most integrity policies treat it like a dictionary or a friend proofreading a comma. Generative features are a different matter. If your class bans AI writing tools, letting Grammarly draft or rewrite your paragraphs is very likely covered by that ban, even though it's built into a tool you're allowed to use.
Policies vary by school, by course and sometimes by assignment, so the only reliable answer is in your syllabus. If it doesn't mention Grammarly, a one-line email settles it: "Is it OK if I use Grammarly for spelling and grammar only, with the AI rewriting features turned off?" Keep the reply. It's useful if anything is ever questioned.
Can Turnitin tell which Grammarly features you used?
No. A detector sees only the final text, not how it was made. It can't see which tool you had open or which suggestions you clicked. It estimates how machine-like the text reads. That's why two students using the same app can get very different scores: one fixed typos, the other accepted rewrites. It's also why a score alone is weak evidence either way, a point made by research showing detectors can be fooled and can misfire (Sadasivan et al., 2023).
How do you use Grammarly without getting flagged?
- Write the draft yourself first. Use Grammarly as a proofreader at the end, not as a co-writer at the start.
- Turn off the generative features if your class bans AI. Grammarly says you can do this in the Feature customization tab of your account settings.
- Accept corrections, think about suggestions. Fix real errors. For style suggestions, accept the ones that sound like you and ignore the rest. Your odd phrasing is part of your voice.
- Don't accept whole-sentence rewrites on graded work unless your instructor allows AI help.
- Keep a record of your process. Write in Google Docs or Word so version history shows the work growing over time. Grammarly also offers Authorship, which labels text as typed, AI-generated, grammar-edited or pasted in (Grammarly).
- Read it aloud before you submit. If a paragraph doesn't sound like you, rewrite it yourself. Our guide to making an essay not sound like AI walks through the fixes, and the list of AI words to avoid catches the vocabulary.
What if Grammarly got your essay flagged anyway?
Don't panic, and don't rewrite the submitted file to make it look different. Ask which passages were flagged and what score the tool gave. Then show your process: version history, earlier drafts, notes, sources, and the Grammarly suggestions you accepted if you can still see them. Offer to talk through the argument. A clear explanation of how you wrote it is much stronger than any second detector's score. The full step-by-step is in how to prove you didn't use AI, and the wider habits are in our pillar guide on how to not sound like AI.
Is Grammarly's AI humanizer the same thing?
No. Grammarly's AI humanizer is a separate rewriting tool. It takes text and rewrites it in a more natural style, which makes it generative by definition. It has its own uses, such as loosening up a stiff work email or a draft you're allowed to write with AI help, but it's the wrong tool for graded work under a no-AI rule. We covered what it does in our Grammarly AI humanizer review.
Frequently asked questions
Does Grammarly count as AI?
It depends on the feature. Spelling and grammar fixes are editing help that most schools allow. Generative features that write or rewrite sentences are generative AI and fall under your school's AI policy.
Does Grammarly get flagged as AI by Turnitin?
Turnitin staff said in 2023 that early tests found ordinary Grammarly corrections were generally not flagged, but GrammarlyGO output likely would be. The more text a tool rewrites, the higher the risk.
Does using Grammarly count as cheating?
Fixing spelling and grammar in your own work usually isn't. Letting it write or rewrite your work can be, if your class bans AI. Check your syllabus or ask.
How do I turn off Grammarly's generative AI?
Grammarly says the generative features are off by default and can be turned off in the Feature customization tab of your account settings.
Can Grammarly prove I didn't use AI?
Grammarly Authorship records how a document was written. Like version history, it's evidence of your process, which counts for more than any detector score.