What AI detector do colleges use? The short answer
What AI detector do colleges use? Many use the AI writing check built into Turnitin, the plagiarism checker they already license. Others use Copyleaks, GPTZero or another tool, and a number of well-known universities have switched AI detection off altogether. Every college named below links to its own announcement or teaching page, so you can check the details yourself.
None of these tools is the same as our free AI checker, which marks each sentence of a draft as reading human or AI. It can show you how your writing reads to one model. It can't show you what your college's tool will say.
- Turnitin's AI writing detection: a separately licensed part of Turnitin. Many colleges have it, and some have turned it off.
- Copyleaks: used by Utah Tech University and Utah State University, for example.
- GPTZero: named by the University of Louisiana System as one of its academic integrity tools.
- Pangram: being evaluated at Portland Community College.
- No AI detector: Vanderbilt, Yale, the University of Waterloo, Curtin University and others have switched Turnitin's AI check off.
Turnitin: the AI check inside a tool colleges already have
Turnitin added AI writing detection in April 2023. By March 2024, the company says, over 200 million papers had been reviewed with it. In the same April 2024 release, Turnitin said more than 16,000 academic institutions, publishers and corporations used its services.
Having Turnitin doesn't mean the AI check runs. Turnitin's FAQ says AI writing detection is only available to customers that license Turnitin Originality, that administrators can switch it off, and that submissions are processed for AI writing only when the institution has the feature enabled. The same FAQ says only instructors and administrators can see the AI indicator, so most students never see the score. The guide on whether Turnitin detects ChatGPT covers what it looks for.
Colleges that do use it tend to frame it carefully. Fresno State turned it on in summer 2025 as a pilot for the 2025-26 academic year. It tells instructors the results are visible only to them and to administrators, and to use the report "as a starting point, not a conclusion". Austin Peay State University offers it through Turnitin Feedback Studio and reminds instructors that the percentage should not be the sole basis for action.
For how far that percentage can be trusted, read is Turnitin's AI detector accurate.
Do colleges use AI detectors? Some switched them off
Several universities decided the risk of wrongly accusing students outweighed what the score added. Each name in the table links to the university's own statement.
| University | What it did | When | Reason it gave |
|---|---|---|---|
| University of Pittsburgh (Teaching Center) | Disabled the AI detection tool in Turnitin and endorses no AI detector | June 2023 | High false positive rates, more likely for non-native English speakers |
| Vanderbilt University | Disabled Turnitin's AI detector | August 2023 | A 1% false positive rate could have meant about 750 of the 75,000 papers it submitted in 2022; bias; little detail on how the tool works |
| Australian National University | Disabled Turnitin's AI writing detection | 1 January 2024 | Not given in the notice |
| Johns Hopkins University | Disabled Turnitin's AI detection | Stated on its teaching site (updated March 2025) | Reports of false positives and fear of falsely accusing students |
| Yale University (Poorvu Center) | Says Turnitin's AI detection feature is "currently disabled" | No date given | Not given on the page |
| University of Waterloo | Discontinued Turnitin's AI detection | September 2025 | Unreliable, biased against students whose first language isn't English, inconclusive internal testing, and the cost |
| Curtin University | Disabled Turnitin's AI writing detection on all campuses; text matching stays | From 1 January 2026 | Trust and clarity, and assessments that are "secure, fair, relevant and future-ready" |
Switching off Turnitin's AI check doesn't always mean a college bans every detector. Johns Hopkins, for instance, says it has no official policy on AI detection software and asks instructors who use a tool to combine it with other evidence.
The list also moves in both directions. At CU Boulder, a free trial of Turnitin's AI detection ended in December 2023 and an advisory group unanimously recommended not supporting it, yet the university is now taking a second look at the tool. A college that has it off today could turn it on next term.
Colleges that use Copyleaks, GPTZero or other AI checkers
Not every college runs its AI checks through Turnitin. A few examples, each from the school's own page or announcement:
- Copyleaks at Utah Tech. Utah Tech University says it has acquired Copyleaks, a plagiarism and AI detector that "now serves as a replacement to Turnitin" (August 2025).
- Copyleaks at Utah State. Utah State University's teaching site describes Copyleaks inside Canvas SpeedGrader, with an AI detection tool. It warns that false positives are possible and more likely for students writing in a second language, and asks instructors to treat the result as "a data point and a conversation starter rather than proof the student cheated".
- GPTZero in the University of Louisiana System. In August 2024 the system named GPTZero as one of its academic integrity tools in an announcement about a new data platform, starting with Grambling State, Louisiana Tech and the University of Louisiana Monroe.
- Pangram at Portland Community College. PCC is evaluating Pangram, with access limited to the faculty, staff and students helping to test it.
Each company trains its own model, so the same paper can get a different score at a different college. That's also why no free checker can show you your college's number, as our page on using a Turnitin alternative to pre-check a draft explains.
These tools usually live inside the learning platform. Turnitin's AI report is available through Canvas, Moodle and Blackboard, Copyleaks sits in Canvas SpeedGrader at Utah State, and GPTZero says its University of Louisiana setup connects to Canvas and Moodle. Whether Canvas has AI detection of its own is a separate question, answered in does Canvas have AI detection.
How teachers detect ChatGPT beyond a detector score
Many of the colleges above tell instructors not to lean on a score. Johns Hopkins' teaching center, for example, suggests these alternatives to detection tools:
- getting to know each student's writing style
- assignments that refer to specific in-class discussions, activities or readings
- asking students for personal examples
- splitting large assignments into stages, so the work develops in steps the instructor can see
- letting students work on assignments during class
In one JHU anthropology course, students whose papers were flagged were invited to talk through the concepts and arguments with the instructor or a teaching assistant. The aim wasn't to accuse them. It was to see whether they understood their own paper.
Some tools now record the writing process instead of judging the finished text. In Turnitin Clarity, students write inside Turnitin, and the Writing Report shows writing time, sessions, pasted text and a playback of how the document grew. UCLA ran a two-term trial of Clarity from Winter to Spring 2026 and has since closed it.
So can teachers detect ChatGPT? Sometimes. But the schools above treat a score as a reason to look closer, and what they weigh is the student's drafts and their ability to explain the work. Our page on AI checkers for teachers walks through a fair review process.
What this means for you as a student
- Read your course policy first. Whether AI is allowed, and how to disclose it, matters more than which detector your college runs.
- Find out which tool is used. Your syllabus, or your college's teaching or IT pages, may say whether Turnitin's AI check is on.
- Don't expect to see the score. Turnitin shows its AI report to instructors and administrators, not students, unless an instructor shares it.
- Keep your writing history. Drafts, notes and version history in Google Docs or Word are the evidence that holds up if your work is questioned.
- Pre-check if you like, but read it as a hint. A free checker shows how your text reads to one model, not what your college's tool will say.
If your own work has been flagged, start with why human writing gets flagged as AI.
This guide is about which tools colleges use, not about getting past them. If your course doesn't allow AI, write the work yourself. If it does, follow its rules on how to say what you used.