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Do colleges check for AI in application essays?

Short answer: it depends on the college, and most don't publish whether they run AI detectors. What they do publish is their rules. If you're finishing an essay for an early deadline, the rules matter more than any detector. Here's what the Common App and several colleges say, in their own words.

Updated October 13, 2026 · By the IsThisAI? team

What the Common App says

The Common App's fraud policy defines application fraud to include "submitting plagiarized essays or other written or oral material, or intentionally misrepresenting as one's own original work: (1) another person's thoughts, language, ideas, expressions, or experiences or (2) the substantive content or output of an artificial intelligence platform, technology, or algorithm." That wording is quoted on Brown's admission site (Brown), and the full policy is on the Common App site (Common App).

In plain terms: submitting AI-written content as your own work counts as fraud under the Common App's own definition. Colleges can add stricter or looser rules on top of that.

Do colleges actually run AI detectors?

Most colleges don't say. A few do:

• NYU says it "does not use AI detection technology as part of the review process," and that while applicants may use AI as a tool, "their final application submission should be their authentic creation" (NYU).
• Johns Hopkins says it adheres to the affirmation statements and policies issued by the Common Application, and that applicants affirm their materials are their own work when they submit (Johns Hopkins).

We couldn't find a public statement from the Common App or most colleges saying whether essays are run through an AI detector. So the honest answer is: you can't assume they don't, and you can't assume they do. Either way, you sign a statement that the work is yours.

It's also worth knowing that AI detectors make mistakes. OpenAI withdrew its own AI text classifier in 2023 "due to its low rate of accuracy" (OpenAI), and a peer-reviewed study found popular detectors flagged essays by non-native English writers as AI far more often than essays by native speakers (Liang et al.). More in our guide to AI detector false positives.

What specific colleges allow

Policies range from almost no AI use to AI as a brainstorming partner. A few examples, from each college's own site:

• Brown: "the use of artificial intelligence by an applicant is not permitted under any circumstances in conjunction with application content." Applicants may use AI for spelling and grammar review, like any proofreading tool (Brown).
• Caltech: its guidelines for Fall 2027 applicants list copying and pasting from an AI generator, relying on AI to outline or draft an essay, replacing your voice with AI content, and translating an essay written in another language as unethical. Using tools like Grammarly or Microsoft Editor to check grammar and spelling of a completed essay, and generating questions to kick-start brainstorming, are listed as ethical. Caltech says failing to follow the guidelines "may result in the rescission of your admission" (Caltech).
• Georgia Tech: says AI can help you "brainstorm, edit, and refine your ideas," but "your ultimate submission should be your own" and you "should not copy and paste content you did not create directly into your application" (Georgia Tech).
• NYU: applicants "may utilize AI as a tool," but the final submission should be their authentic creation (NYU).

These are only examples. Every college sets its own rules, and they change from year to year, so check the admission site of each school on your list.

How to stay safe before your deadline

1. Read each college's AI policy. Search the college's admission site for "AI" or "artificial intelligence." If a school doesn't have one, the Common App definition still applies when you apply through it.
2. Write the draft yourself. Every policy above draws the line at AI writing or drafting your essay.
3. Keep your drafting history. Writing in Google Docs or Word keeps a version history that shows how your essay developed. See how to prove you didn't use AI.
4. Be careful with grammar tools. Some colleges allow spelling and grammar checks; that's different from letting a tool rewrite your sentences. See will Grammarly get flagged as AI?
5. Don't use a "humanizer." Running AI text through a rewriter doesn't make it your work under any of these policies. See do AI humanizers work?

Checking your own essay

If you wrote your essay yourself and want to see whether any passages read as AI-like, you can paste it into our free detector. It runs in your browser, so your essay isn't uploaded. Treat the result as a rough signal, not a verdict: no detector, including ours, can prove who wrote something, and a high score on your own writing usually just means some sentences are generic. Rewriting those in your own specific words tends to make an essay better anyway.

More guides

Sources

1. Common App, "Fraud Policy". https://www.commonapp.org/fraud-policy/
2. Brown University Undergraduate Admission, "Integrity in the Application Process" (section: Artificial Intelligence in the Application Process; quotes the Common App fraud definition). https://admission.brown.edu/apply/how-apply/integrity-application-process
3. Caltech Undergraduate Admissions, "Ethical Use of AI: Guidelines for Fall 2027 Applicants". https://www.admissions.caltech.edu/apply/first-year-applicants/supplemental-application-essays/ethical-use-of-ai-guidelines-for-fall-applicants
4. Georgia Tech Undergraduate Admission, "Application Review Process" (Statement on AI). https://admission.gatech.edu/first-year/application-review
5. NYU Undergraduate Admissions, "How to Apply" (AI use in the Application). https://www.nyu.edu/admissions/undergraduate-admissions/how-to-apply.html
6. Johns Hopkins University Admissions, "Frequently Asked Questions" (What is your policy on the use of AI in an application?). https://apply.jhu.edu/frequently-asked-questions/
7. Liang, Yuksekgonul, Mao, Wu & Zou, "GPT detectors are biased against non-native English writers," Patterns 4(7), 2023. https://www.cell.com/patterns/fulltext/S2666-3899(23)00130-7
8. OpenAI, "New AI classifier for indicating AI-written text" (Jan 2023; updated July 20, 2023 when the tool was withdrawn). https://openai.com/index/new-ai-classifier-for-indicating-ai-written-text/

This guide is general information, not legal or academic-policy advice. AI detection results, including ours, can be wrong.