Best AI DetectorsEvery reading on the record
Subject

The best AI checker like Turnitin

Tested
In progress since 9 November 2026
Updated
November 9, 2026

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.

Two printed reports side by side on chart paper
The sample set on the desk, with the pick's reading beside it.

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.

False alarms count student essays scored as AI, out of the whole student set. Detection counts AI essays caught, out of the whole AI essay set.
PlaceToolScore for teachersFalse alarms on student essaysReadingDetection on AI essaysFree planBest forMain limitation
1CopyleaksPick for teachersTest in progressTest in progressTest in progressLimited free creditsDepartments choosing one toolReports are hard to read
2GPTZeroPick for teachersScore pending0 of 10020 of 20YesTeachers marking essaysShort texts score unreliably
3Originality.aiPick for teachersScore pending0 of 10020 of 20Trial creditsEditors checking batchesNo permanent free plan
4PangramPick for teachersTest in progressTest in progressTest in progress20 checks a dayA second reading you can defendFree plan caps daily checks
5ScribbrPick for teachersTest in progressTest in progressTest in progressYesStudents checking one paperPremium check is sold per document

One student essay, two readings

Sample H-002 · student work, written without AI · run RUN-2026-11-A

Ch. 1GPTZero
Scored human on every paragraph
Ch. 2Originality.ai
Scored human on every paragraph
Text as scored
P1

While 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% AI
P2

Many 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% AI
P3

While 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% AI
P4

There 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% AI
P5

With 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% AI
Ch. 1 readingCh. 2 readingFalse alarm: human writing scored as AI

Scroll 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.

  1. If you need an institution-style report

    Choose Copyleaks for phrase highlights and shareable reports.

  2. If you want sentence highlights

    Choose GPTZero for its free plan with highlights.

  3. If you check many papers

    Choose Originality.ai on a monthly plan sized for volume.

  4. 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
Student essays100
Second language20
AI essays80
Detectors8
Fixed weights. Together they make the score for teachers.
FactorWeightWhat it measures
False alarms on human writing40%Student essays scored as AI
Detection on raw AI text30%Unedited AI essays scored as AI
Detection on human-edited AI text15%AI essays a person revised, scored as AI
Access and price15%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.

Ch. 1

Copyleaks

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 rowsSamplesScored as AI
All sample rows180Test in progress
Ch. 2

GPTZero

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 rowsSamplesScored as AI
Student essays, no AI600 of 60
Second language essays, no AI200 of 20
Professional prose, no AI200 of 20
AI essays, raw20 of 60 so far20 of 20
AI essays, edited by a person20Test in progress
Ch. 3

Originality.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 rowsSamplesScored as AI
Student essays, no AI600 of 60
Second language essays, no AI200 of 20
Professional prose, no AI200 of 20
AI essays, raw20 of 60 so far20 of 20
AI essays, edited by a person20Test in progress
Ch. 4

Pangram

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 rowsSamplesScored as AI
All sample rows180Test in progress
Ch. 5

Scribbr

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 rowsSamplesScored as AI
All sample rows180Test 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.

  1. 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.

  2. 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.

  3. 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

  4. 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.