What's the best AI detector for teachers in 2026?
A percentage won't hold up in a parent meeting. Evidence of how the essay was written will.
Short answer: if your class turns in work through Google Classroom or Canvas, start with GPTZero. It plugs into both and replays how a Google Doc was written. If false accusations are your biggest worry, Pangram claims the lowest false positive rate on the market. If your budget is zero, the free Brisk Teaching extension plus Google Docs version history will tell you more than any score.
Longer answer: every detector gives you a probability, never proof. Even the vendors say so. This page compares six tools on what matters in a real classroom (LMS integration, student data, evidence beyond a number, cost for a single teacher) and then walks you through a process that lets you act without accusing the wrong kid.
The ranking is editorial: a sponsored spot is always labeled on its card, and no affiliate link changes a score.
The best AI detector for your classroom
Classroom and Canvas integration, plus writing replay in Google Docs
You can't afford a false accusationLowest claimed false positive rate, sentence-level highlights
You have no budgetFree Chrome extension that shows how the essay was built
6 AI detectors for teachers, side by side
Rank follows classroom fit: does the tool live where students submit work, does it show you more than a percentage, and can one teacher afford it? The score out of 5 uses the same five weighted criteria as our general AI detector ranking, so a tool gets the same score everywhere on the site. That's why Originality.ai and Compilatio, with higher scores, sit behind Pangram here.
Turnitin isn't in the table. It's the default in many districts and universities, but it only sells to institutions on a quote, so you'll use it if your school already pays for it, not because you picked it.
| Best for | Where it plugs in | Free plan | Team size | Visit | ||||
|---|---|---|---|---|---|---|---|---|
| 6 | Compilatio Magister+ | Best for multilingual campuses | Moodle, Canvas, Brightspace, Teams, Blackboard | 4.0/5 | Quote only, institutional license | — | University, international school | Visit → |
| 3 | Originality.ai | Best for pay-per-word | Moodle (Enterprise), Google Docs, Chrome | 3.9/5 | $14.95/mo ($12.95 annually) | — | Department, writing program | Visit → |
| 1 | GPTZero | Best for Google Classroom | Google Classroom, Canvas, Google Docs, Chrome | 3.7/5 | Monthly or annual plans (45% off annually) | ✓ | K-12 teacher, department | Visit → |
| 4 | Brisk Teaching | Best free option | Google Docs, Chrome extension | 3.7/5 | Free, school plans on quote | ✓ | Middle and high school teacher | Visit → |
| 2 | Pangram | Best for avoiding false positives | Google Classroom, Moodle, Blackboard, Brightspace | 3.4/5 | Free (4 credits/day), then $20/mo | ✓ | Teacher, academic integrity panel | Visit → |
| 5 | Winston AI | Best no-card trial | Google Classroom, Chrome, API | 3.3/5 | $18/mo ($10 annually) | — | Solo teacher, small team | Visit → |
Scores use five weighted criteria, the same as our general AI detector ranking. Pangram's score matches its full review. Prices read on official vendor pages in 2026.
How we compared and ranked
A teacher doesn't use a detector the way a content marketer does. You grade 30 essays at once, usually inside an LMS, written by teenagers or undergrads, and you may have to explain your concern to a 15-year-old and then to their parents. So we compared six tools on three classroom questions that set the rank: does it work inside Google Classroom, Canvas or Moodle? Does it protect student data (FERPA, no training on student work)? Does it show evidence beyond a score, like flagged sentences or a replay of the writing process?
The score out of 5 follows our five usual criteria with the same weights on every detector page, so one tool always carries one score. We didn't open accounts with vendors: facts come from their official pages and docs, published studies, and teacher feedback.
- Features and depthSentence-level detail, plagiarism, process evidence such as version history or writing replay, languages.30%
- Value for moneyReadable prices, free tier or pay-per-word option, cost for one teacher.25%
- Ease of useChecking a whole class without pasting each essay, results a non-specialist can read.20%
- Customer support and assistanceHelp rolling out across a school, honest documentation on error rates.15%
- Available integrationsGoogle Classroom, Canvas, Moodle, Brightspace, Google Docs, browser extension.10%
No affiliate link changes a score or a rank.
GPTZero
GPTZero is the most classroom-focused tool on this list. It's an official partner of the American Federation of Teachers and says it serves 10 million teachers and students. Its LMS module, called Scaffold, plugs into Google Classroom and Canvas. A Moodle page is announced, but we couldn't review that page, so ask for a demo before you count on it.
What matters most for a teacher is the Google Docs extension. It replays how the document was written and flags large pastes and unusual typing. That's the kind of evidence you can put in front of a student, and it's far stronger than "the tool said 87%".
On data, GPTZero lists SOC 2 Type II, FERPA compliance, deletion on request, plus a HECVAT and VPAT for procurement. Users still complain about false positives on formal academic writing and about annual plans billed upfront. And the vendor admits short or heavily edited texts are harder to call.
- Google Classroom and Canvas integration
- Writing replay inside Google Docs
- FERPA compliance and HECVAT for procurement
- ✓Built for schools, with a dedicated educator offer
- ✓Shows the writing process, not just a number
- ✓45% off on annual billing
- ✗Plan prices don't render on its public pricing page
- ✗False positives reported on formal writing
- ✗Annual plans billed in one go
The default pick if your class lives in Google Classroom and you want process evidence. If your district already pays for Turnitin, use GPTZero's free tools to add the writing replay Turnitin doesn't give you by default.
Pangram
Pangram built its name on one number: it claims one false positive in 10,000 human texts. That's the vendor's figure, not an independent audit, but it's the right fight for a teacher. In a classroom, the costly error is the honest kid who gets flagged.
The Google Classroom add-on lets you switch detection on assignment by assignment, and each submission gets an AI likelihood score. Pangram also lists Moodle, Blackboard and D2L Brightspace. Its Chrome, Firefox and Google Docs extensions highlight suspect passages sentence by sentence. On the enterprise plan, student work isn't used to train the model.
Pangram's own advice to teachers is sound: compare with the student's earlier work, check citations, and talk about the process before any penalty. The catch is cost. Four free credits a day won't cover a class, there's no public education price, and support is the weak spot in user feedback.
- Google Classroom add-on, per assignment
- Sentence-level highlights
- Student work not used for training (enterprise)
- ✓Lowest claimed false positive rate on the market
- ✓Several LMS beyond Classroom
- ✓Vendor guidance centered on conversation, not punishment
- ✗4 free credits a day is far too few for a class
- ✗No public education pricing
- ✗Support rated slow by users
The detector to pick when not wrongly accusing a student is your first rule. For a full class, plan on a paid seat or a school deal.
Originality.ai
Originality.ai comes from the content marketing world, but it now has an education offer and an "Academic" model tuned for student writing. Its pricing makes sense for teams: $0.01 per 100 words, and unlimited teachers on one account. Pro at $12.95 a month billed annually covers 200,000 words, which is roughly 130 essays of 1,500 words.
There's a Moodle plugin on the Moodle marketplace, but it's for Enterprise customers with an API key. A single teacher will use the Chrome extension, the Google Docs add-on or plain copy-paste. The vendor claims 99%+ accuracy and under 1% false positives for the academic model, and, to its credit, says a score should never be the only signal.
Two caveats. A credit card is required. And the model has a reputation for being strict, with users reporting human writing marked as AI.
- Unlimited teachers per account
- $0.01 per 100 words
- Moodle plugin on Enterprise
- ✓Easy-to-forecast per-word cost for teams
- ✓Model built for academic writing
- ✓History deletion and training opt-out
- ✗Moodle only on Enterprise
- ✗Credit card required
- ✗Known for being harsh on human writing
A solid choice for a department that checks a lot of text on one shared account. For a single middle school teacher, it's more tool than you need.
Brisk Teaching
Brisk Teaching isn't a detector first. It's a free Chrome extension for teachers with more than 20 tools for feedback, leveling and lesson prep. The one that matters here is Inspect Writing: it plays back the writing of a Google Doc as a video. You see the typing, the big chunks pasted in at once, and the deletions. It adds an AI indicator on a scale from "Unlikely" to "Likely".
For K-12, it's the best effort-to-insight ratio on this page. The conversation with a parent changes from "the tool says 87%" to "this essay appeared in 30 seconds with no draft". Brisk itself says no detection is 100% reliable.
The limits are clear. It only works if the student wrote in Google Docs and you have edit access to the file. Brisk doesn't spell out whether Inspect Writing is fully included on the free tier, so use the 14-day Premium trial you get at sign-up to check.
- Free Chrome extension
- Video replay of the writing process
- 20+ teacher tools in one place
- ✓Process evidence, the most convincing kind
- ✓Zero cost to start
- ✓Set up in minutes
- ✗Useless if students don't write in Google Docs
- ✗Free tier scope for Inspect Writing is unclear
- ✗AI indicator less detailed than a dedicated detector
The first thing to install if you have no budget and your students write in Google Docs. Pair it with a real detector for uploaded files.
Winston AI
Winston AI checks a few boxes for teachers: a trial without a credit card, a Google Classroom integration listed on its site, and an education offer on request. Prices are clear: $10 a month billed annually for the entry plan, and up to five members on Advanced, which fits a small department.
On data, Winston says it is GDPR compliant, holds SOC 2, and doesn't train on customer content. It also handles a long list of languages, useful if you teach English learners who sometimes draft in Spanish.
The downside: the site doesn't explain how the Classroom integration actually works. And users report the same problem as with other detectors: text that is well written, coherent and concise gets flagged. That's the profile of your best students.
- No-card trial
- Google Classroom listed
- Up to 5 members on Advanced
- ✓Readable prices, annual nearly half off
- ✓Customer content not used for training
- ✓Billing rated fair by users
- ✗Classroom integration not explained
- ✗False positives on polished writing
- ✗Monthly price steep next to annual
Fine for a solo start: try it on your own students' past essays before you pay. For anything that affects a grade, prefer a tool that shows the writing process.
Compilatio Magister+
Compilatio is a European plagiarism checker that is little known in the US but used by several universities in Spain and France. Its teacher product is Magister, and AI detection comes with Magister+. The report combines plagiarism and passages "likely to have been generated" by ChatGPT, Gemini or Claude, which is the honest way to phrase it.
Its strength is reach. It lists seven native integrations: Moodle, Canvas, Brightspace (D2L), Microsoft Teams, Open LMS, Blackboard and Cineca. In Moodle, essays are checked as students submit them, across assignments, workshops and forums. Data is hosted in Europe.
It ranks last here because it's a weak fit for a single US teacher. There's no public price, your institution signs the contract, and US-specific paperwork such as FERPA isn't front and center on its pages.
- Seven native LMS integrations
- Plagiarism and AI in one report
- European data hosting
- ✓Strong on French and Spanish, not just English
- ✓Essays checked at submission, no copy-paste
- ✓Careful wording of results
- ✗Quote only, no public price
- ✗AI detection needs Magister+, not base Magister
- ✗Little US-specific compliance info
A strong pick for a multilingual campus on Moodle or Brightspace. For a US K-12 classroom, GPTZero or Brisk will be easier to get approved.
A score isn't evidence: what holds up
Most of the pages ranking for this search are written by vendors or affiliates. Almost none tell you what happens when a parent asks how you know. Three things to settle before you put a zero in the gradebook.
Error rates, scaled to your school
A detector that's wrong 1% of the time sounds safe. Now take 500 students writing 10 essays a year: that's 5,000 essays and around 50 kids flagged for work they wrote. A 2023 study was worse: seven detectors wrongly labeled 61% of essays by non-native English writers as AI. English learners, students with learning differences and very formulaic writers are the most exposed.
Universities are pulling back
Some US universities have reportedly switched off AI detection in their plagiarism tools, citing false positives. In Australia, a university that leaned on detection reportedly accused around 6,000 students in 2024 before dropping the tool. A score can open a conversation. It shouldn't close a case.
Student work is student data
Pasting a named essay into a free website shares an education record with a third party. Under FERPA, your district decides which vendors can receive that data. Strip names and IDs, or stick to the tool your school has approved. GPTZero and Pangram both publish data commitments; ask your tech coordinator before you sign up on your own.
- Never grade or report on a percentage alone.
- Save the full report with highlighted sentences, not a screenshot of the score.
- Compare with something the student wrote in class before you conclude anything.
- Remove names and student IDs before pasting work into any online tool.
- Follow your school's academic integrity process instead of handling it alone.
- Don't run three detectors to "confirm": they often share the same blind spots.
Six moves to check an essay without a false accusation
These come from teacher feedback and from the vendors' own guidance. None of them requires buying anything. Together, they give you a record a student, a parent and an administrator can follow.
Have students draft in a shared Google Doc
FreeAsk for drafts in a doc shared with you as an editor. Then open File, Version history, See version history. You'll see whether the text arrived in one block or grew through edits over several days. Brisk, Draftback and GPTZero's writing replay turn that history into a short video you can review in two minutes.
- You need
- Edit access to the doc
- Cost
- $0
Keep an in-class writing sample on file
MethodOne paragraph written in class early in the year, by hand or on a supervised device, gives you the student's real voice. A sudden jump in vocabulary, syntax or structure between that sample and a take-home essay is a far stronger signal than any score. Pangram recommends exactly this in its teacher guidance.
- When
- First weeks, then once per term
Ask the student to walk you through a paragraph
Most reliableFive minutes is enough. Ask them to restate their main point, explain a word they used, or tell you where a quote came from. A student who wrote the essay remembers it, even if clumsily. This is the move that holds up best in front of parents.
- Time
- 5 minutes per student
Check two citations at random
Strong signalAI tools invent plausible sources: books that don't exist, wrong page numbers, quotes pinned on the wrong author. Check two references. A made-up source is concrete evidence you can show, unlike a percentage.
- Check
- Author, title, page
Run your detector on known essays first
Before school startsRun three student essays from before 2022, when AI writing wasn't an option, and three texts you generate yourself. If the tool flags even one of the old essays, you know how much weight to give it. Ten minutes now saves a student months of appeals later.
- Sample
- 3 pre-2022 essays and 3 AI texts
Write prompts an AI handles badly
PreventionPrompts that build on a class discussion, a local example or a personal experience are harder to outsource. Some teachers hide a white-text trap word in the prompt; one Mississippi history teacher caught 32 of 35 essays that way. We don't recommend it: a student using a screen reader falls into the trap without cheating, and the class reads it as a setup.
- Avoid
- Hidden traps in the prompt
Where to go from here
These pages pick up where this one stops, on detection and on what students use.
Six tools compared on false positives and price.
You're weighing a Pangram planOur Pangram reviewReliability, false positives, price and fit.
Your students use QuillBotQuillBot alternativesThe consumer writing tools students already know.
You want to know what your students useAI humanizers for studentsThe tools that rewrite AI text.
You wonder how detectors get bypassedHumanizers and detector bypassWhat these tools promise and where they fail.
You want something other than PangramPangram alternativesOther detectors worth a look.
AI detectors for teachers · FAQ
What AI detector do most teachers use?
In US schools and colleges, Turnitin is very common in districts and universities, which often already license it for plagiarism checks. Teachers who choose for themselves often go with GPTZero, which is free to start and plugs into Google Classroom. Check what your school already pays for first.Can teachers tell if you used ChatGPT?
Sometimes, but rarely from a detector score alone. The strongest signals are a draft history with one big paste, a sudden jump from in-class writing, invented sources, and a student who can't explain their own paragraph. Detectors help flag what to look at, not decide.Is there a free AI detector for teachers?
Yes, but none is reliable enough to act on alone. Brisk Teaching is a free Chrome extension that replays writing in Google Docs. Pangram gives 4 free credits a day. For a whole class, Google Docs version history is the free tool that does the real work.Should I give a zero based on an AI detector score?
No. Vendors themselves say a score should never be the only signal, and detectors misfire most on English learners and formulaic writers. Gather process evidence, talk with the student, and follow your school's integrity policy before any grade change.Is it FERPA-compliant to paste student essays into a detector?
Only if the vendor is approved by your district or the work is fully de-identified. A named essay is part of an education record. GPTZero states FERPA compliance and publishes procurement documents, but your district still decides. Remove names and IDs when in doubt.Which AI detectors integrate with Google Classroom or Canvas?
Google Classroom: GPTZero, Pangram and Winston AI. Canvas: GPTZero and Compilatio, with Turnitin through your institution. Moodle: Compilatio, Pangram and Originality.ai on its Enterprise plan. Copyleaks also offers Canvas, Moodle and Classroom connectors, but we couldn't read its prices.What should I do if a student denies using AI?
Listen, then move to evidence you can both look at. Ask for drafts or the doc history, and have them explain a paragraph out loud. If they defend the work comfortably, drop it. A Virginia student whose personal essay scored 92% AI spent two months on appeals before being cleared.Can detectors catch AI text a student has edited?
Not well. GPTZero admits short or heavily edited texts are harder to classify, and students use humanizer tools built to fool detectors. That's another reason to look at how the essay was written rather than how it reads.
