The best AI checker like Turnitin
Closest to Turnitin: Copyleaks. Its readings in our run: Test in progress
Tested: In progress since 9 November 2026. Page updated: .
Short answer
Turnitin is sold to schools, not to people, so the question is which checker comes closest. Copyleaks is the pick: anyone can buy it, and its phrase highlights and shareable reports are the nearest to an institutional report. Our run is still scoring it.
No checker can predict what Turnitin will say about a paper. Use one to understand your own writing, not to guess a score.
Run RUN-2026-11-A started on 9 November 2026 and is in progress: GPTZero and Originality.ai are scored on the first 120 samples, and every other tool shows a test in progress tag until its readings are in.
The pick table for teachers
Scored on student work only: essays written without AI, essays by students writing in a second language, and AI essays.
| Place | Tool | Score for teachers | False alarms on student essays | Reading | Detection on AI essays | Free plan | Best for | Main limitation |
|---|---|---|---|---|---|---|---|---|
| 1 | Test in progress | Test in progress | Test in progress | Limited free credits | Departments choosing one tool | Reports are hard to read | ||
| 2 | Score pending | 0 of 100 | 20 of 20 | Yes | Teachers marking essays | Short texts score unreliably | ||
| 3 | Score pending | 0 of 100 | 20 of 20 | Trial credits | Editors checking batches | No permanent free plan | ||
| 4 | Test in progress | Test in progress | Test in progress | 20 checks a day | A second reading you can defend | Free plan caps daily checks | ||
| 5 | Test in progress | Test in progress | Test in progress | Yes | Students checking one paper | Premium check is sold per document |
One student essay, two readings
Sample H-002 · student work, written without AI · run RUN-2026-11-A
GZGPTZero
OAOriginality.aiWhile the idea of having a fully-autonomous is very real, scientists are still very far from it. Research is being conducted every day to improve the efficeincy and safefty of these new semi-autonomous vehicles. In my opinion, driverless cars are inevitable and I would not doubt that I will end up seeing one in my lifetime. But as of right now, cars can't do as much as scientists are hoping for in the future. With that being said, I will there will be a more positive outcome of driverless cars than negative.
Ch. 10% AICh. 22% AIMany skeptics say dirverless cars will never be possible. But, what they don't realize is that we are closer than we ever have been before regardless of how much research is still necessary to succesfully make a fully autonomous car. Google's concept car has been able to drive over half a million miles without a crash. Their car still requires a driver, but it is only for more advanced tasks such as traffic issues or roadwork. Other companies have also attempted to create a driverless concept car and the concepts have showed potential. They are far from driverless but they are going in the right direction. BMW announced that their car could handle driving speeds of up 25 mph but still require the focus of a human being behind the wheel.
Ch. 10% AICh. 22% AIWhile I am very supportive of driverless cars, I think there will always be flaws, no matter the size. I think there will always be malfunctions but that does not mean that those can be fixed either. The research that has been put into these vehicles have been very strenuous and have proven that there will never not be flaws in creating an autonomous car. They still may crash but the probability of a fatal crash in a driverless is much lower than the probability of a fatal crash due to human error. Humans get distracted thus creating more chances for an accident to occur. With driverless cars, there is no chance of human error or the car getting distracted because driving is what it was built for.
Ch. 10% AICh. 22% AIThere are not many current laws or regulations on autonomous cars, so even if Google or BMW were to finish research and create a flawless and driverless car, they wouldn't be able to manufacture them on a commercial level. This is because there wouldn't be any laws covering liability in the case of an accident, if an accident were to somehow occur. It is undetermined who would be at fault for the accident according to the state. I think the company should be more at fault, considering they are advertising these cars as "driverless".
Ch. 10% AICh. 22% AIWith my opinion on driverless cars being said, I still think they are a good idea and will benefit society in the long run and keep more people safe. There are bumps in the road regarding laws and the time it will take to get to where big name companies want to be. But, if we are all patient and let scientists conduct quality research, I see a bright future for fully autonomous cars.
Ch. 10% AICh. 23% AIScroll the chart sideways to read every paragraph.
Which AI detector is best for teachers?
It depends on how you mark and what your school already pays for.
If you need an institution-style report
Choose Copyleaks for phrase highlights and shareable reports.
If you want sentence highlights
Choose GPTZero for its free plan with highlights.
If you check many papers
Choose Originality.ai on a monthly plan sized for volume.
If you want one paper checked well
Choose Scribbr and buy a single premium check.
How did we rank detectors for teachers?
For this page we scored every detector on student work only: essays students wrote without AI, essays by students writing in a second language, and AI essays, both raw and edited by a person.
False alarms on student writing carry the most weight, because a wrong flag lands on a real student. Detection on raw AI text comes next, then detection on AI text a person has edited, then access and price.
Every number on this page comes from run RUN-2026-11-A. The CSV for that run is on the test runs page.
Read how we test| Factor | Weight | What it measures |
|---|---|---|
| False alarms on human writing | 40% | Student essays scored as AI |
| Detection on raw AI text | 30% | Unedited AI essays scored as AI |
| Detection on human-edited AI text | 15% | AI essays a person revised, scored as AI |
| Access and price | 15% | Free plan, limits, school sign up |
Every detector, the same fields
Verdict, score, who it suits, what it gets wrong, the price on the day we checked, and how it read the student set.
CLCopyleaks
Closest to Turnitin- Verdict
- One tool a department can share, with reports staff can keep.
- Score
- Test in progress
- Sub-scores
- Readings Test in progress
- Best for
- Departments choosing one tool
- Main limitation
- Reports are hard to read
- Price and plan limit
- $16.99 a month, 100 credits. Free plan: Limited free credits. Checked on
| Sample rows | Samples | Scored as AI |
|---|---|---|
| All sample rows | 180 | Test in progress |
GZGPTZero
- Verdict
- The pick for marking essays. Open the sentence view before you act on any flag.
- Score
- Score pending
- Sub-scores
- False alarms 0 of 100Raw AI 20 of 20Edited AI Test in progress
- Best for
- Teachers marking essays
- Main limitation
- Short texts score unreliably
- Price and plan limit
- CA$25.99 a month (Premium, monthly), 300,000 words. Free plan: Yes. Checked on
| Sample rows | Samples | Scored as AI |
|---|---|---|
| Student essays, no AI | 60 | 0 of 60 |
| Second language essays, no AI | 20 | 0 of 20 |
| Professional prose, no AI | 20 | 0 of 20 |
| AI essays, raw | 20 of 60 so far | 20 of 20 |
| AI essays, edited by a person | 20 | Test in progress |
OAOriginality.ai
- Verdict
- Built for editors and batches, priced for regular use.
- Score
- Score pending
- Sub-scores
- False alarms 0 of 100Raw AI 20 of 20Edited AI Test in progress
- Best for
- Editors checking batches
- Main limitation
- No permanent free plan
- Price and plan limit
- $14.95 a month, 200,000 words. Free plan: Trial credits. Checked on
| Sample rows | Samples | Scored as AI |
|---|---|---|
| Student essays, no AI | 60 | 0 of 60 |
| Second language essays, no AI | 20 | 0 of 20 |
| Professional prose, no AI | 20 | 0 of 20 |
| AI essays, raw | 20 of 60 so far | 20 of 20 |
| AI essays, edited by a person | 20 | Test in progress |
PGPangram
- Verdict
- The careful second reading. Use it when a flag will be argued over.
- Score
- Test in progress
- Sub-scores
- Readings Test in progress
- Best for
- A second reading you can defend
- Main limitation
- Free plan caps daily checks
- Price and plan limit
- $20 a month, 300,000 words. Free plan: 20 checks a day. Checked on
| Sample rows | Samples | Scored as AI |
|---|---|---|
| All sample rows | 180 | Test in progress |
SCScribbr
- Verdict
- Free basic check; the premium check is bought per paper.
- Score
- Test in progress
- Sub-scores
- Readings Test in progress
- Best for
- Students checking one paper
- Main limitation
- Premium check is sold per document
- Price and plan limit
- From $19.95 a document. Free plan: Yes. Checked on
| Sample rows | Samples | Scored as AI |
|---|---|---|
| All sample rows | 180 | Test in progress |
Can a checker tell you what Turnitin will say?
No checker can predict another tool's score.
Each detector uses its own model and its own line for a flag, so scores do not transfer between tools. In Perkins and colleagues (2024), seven detectors gave different results on the same samples. Turnitin itself states that its document false positive rate of under 1% applies to documents with over 20% AI writing, according to its own guidance for academic leaders.
Read the sentences, not the number
Open the sentence or paragraph view and see what drove the score. A textbook style paragraph, like P3 above, often explains the whole flag.
Compare with work you know
Set the flagged essay beside the student's earlier writing. A sudden change in voice tells you more than a percentage.
Ask the student about the draft
Ask how they wrote it, what they changed and what they read. Drafts, notes and version history answer more than any detector.keep the version history
Record what you found
Note what you checked and what the student said, not only the score. If the case goes further, the score should never stand alone.
No detector score should be the only evidence in a misconduct case.
Questions from teachers
Can I use Turnitin as a student?
Not on your own. Turnitin says it sells only to institutions, so students see it through their school's learning platform when a teacher turns it on.
What is the closest AI checker to Turnitin?
Copyleaks: anyone can buy it, and its report is the nearest to an institutional one. Its readings in run RUN-2026-11-A are in progress.
Will a clean score here mean a clean Turnitin score?
No. Tools use different models and thresholds, and Perkins and colleagues (2024) found the same samples scored differently across seven detectors.
Related reading
Turnitin Alternatives for AI Detection (2026)For people and schools without a licence.
GPTZero vs Turnitin: Accuracy, Access and ReportsWho can use each, and how they read.
Copyleaks vs Turnitin: AI Detection ComparedSchools and individuals, side by side.
Best AI Detector for Students: Check Before You SubmitCheck your own draft before it goes in.