GPTZero is the detector your colleagues and administrators already recognise, with the original perplexity plus burstiness methodology and Origin for Educators on the paid tier. TextSight is the newer classroom pick with sentence-level highlights on the free tier, an ESL-aware classifier that flags roughly 40 percent fewer false positives on non-native student writing, a free Chrome extension for Google Classroom, and a .edu Pro price of $13.99 a month. The pre-Turnitin conversation tool, head to head, no marketing spin. Free to try, no card.
Teachers are not students. The job is not pre-scanning one essay before a deadline. It is triaging thirty essays per class, multiple classes per day, against the background risk that flagging an honest student wrongly turns into a parent complaint, a department meeting, and a career-defining mistake.
Both GPTZero and TextSight scan student writing, return an AI probability, and highlight suspicious sentences. Because they overlap so directly, the comparison comes down to four things teachers care about: defensible evidence in a meeting, false-positive risk on ESL and STEM writing, classroom integration, and pricing for teachers paying out of pocket.
A document-level score without sentence-level highlights is hard to defend in an integrity hearing. If your only answer is the detector said seventy percent, any reasonable parent will ask how a probability becomes a finding. GPTZero highlights sentences on its paid tier and shows branded Burstiness and Perplexity scores. TextSight includes full five-band sentence highlights on the free tier so you can point to specific lines, not just a single percentage.
Formal English instruction in Indian, Chinese, Korean, and many European schools teaches the same five-paragraph structure that ChatGPT defaults to. Detectors not calibrated for ESL register over-flag students for essays they wrote themselves, and the same pattern hits STEM lab reports and strict APA writing. TextSight is explicitly tuned for ESL writing with roughly 40 percent fewer false positives on non-native English. GPTZero is general-purpose and has acknowledged ESL false-positive risk publicly.
Wednesday afternoon, you open Google Classroom, click through submissions, and on the third essay something feels off. The question is how many tabs and copy-paste hops it takes to confirm. TextSight ships a free Chrome extension that scans selected text on the Classroom submission page inline. GPTZero offers Origin for Educators for deeper LMS sync at the paid education tier.
Most K-12 teachers pay personally. District reimbursement cycles take months. TextSight Pro is $19.99 a month standard and $13.99 a month with a verified .edu email, the lowest paid-tier price in the classroom detector category. GPTZero Premium is around $14.99 a month flat with no .edu discount.
The honest classroom spec sheet. Where each one wins for teachers, in one scrollable table.
| Feature | TextSight | GPTZero |
|---|---|---|
| Primary product | AI detector with sentence-level evidence and Authenticity Score | AI detector built on perplexity plus burstiness methodology |
| Detection type | Multi-signal classifier, 5-band sentence map, ESL-tuned | Perplexity and burstiness, branded academic methodology |
| Free tier | 10,000 chars/day (4 to 6 essays), no card required | Around 10 scans/day at 10,000 chars/scan after signup |
| Pricing model | Free + 3 paid tiers (Starter / Pro / Business), monthly or yearly | Free + Premium + Origin for Educators (district tier) |
| Entry price | Starter $9.99/mo or $7.49/mo yearly | Premium $14.99/mo flat (no lower entry tier) |
| Pro annual effective | $14.99/mo (billed $179.88/year) | $14.99/mo flat (no annual discount on Premium) |
| .edu discount | $13.99/mo Pro with verified .edu email | None on Premium; Origin priced at district tier |
| Sentence-level evidence | Full 5-band highlights on free tier (Original to AI Generated) | Limited granularity on free; full highlights on paid |
| ESL FPR (100-passage) | 6% on non-native English samples | 22% on non-native English samples |
| Native FPR (100-passage) | 3% on native English samples | 5% on native English samples |
| GPT-4 TPR (100-passage) | 92% on GPT-4 generated essays | 89% on GPT-4 generated essays |
| Claude TPR (100-passage) | 90% on Claude generated essays | 86% on Claude generated essays |
| Bundled AI rewriter | Yes, ethical scope; 50,000 words/mo on Pro | No bundled AI rewriter; detection-only product |
| REST API | Yes, on Business tier ($29.99/mo yearly) | Yes, on Origin for Educators and API plans |
| Best fit | Teachers needing defensible sentence evidence, ESL classrooms, .edu pricing | Districts that need recognised brand, Origin LMS sync, procurement-tier vendor |
Numbers reflect published 2026 pricing pages and our internal benchmarks on 2,400 student essays. Verify on the vendor pricing page before committing to a paid plan.
Yearly billing saves 25 percent. .edu Pro discount available with verified school email. Full details on the pricing page.
Billed $89.88/year, save $30
Billed $179.88/year, save $60
Billed $359.88/year, save $120
For comparison, GPTZero Premium is around $14.99 a month with no .edu discount. View full pricing →
Honest call-outs. These are real reasons many teachers and departments stay with GPTZero, especially in districts that adopted it early.
GPTZero is the AI detector that landed in the New York Times, the BBC, NPR, and pretty much every back-to-school explainer your administrator has read. When the committee asks what tool you used, GPTZero lands without explanation. For the highest-stakes meetings, brand familiarity is part of the evidence package, and adoption beats accuracy every time.
GPTZero has been in market since 2023 with K-12 and university case studies, peer-reviewed methodology coverage, and teacher reviews. For policy committees that want established vendors, GPTZero clears the procurement bar more easily. If your district has standardised on it, use it. The procurement battle is rarely worth fighting for a marginal detector improvement.
GPTZero free gives around 10 scans a day at 10,000 characters per scan after signup. TextSight free gives 10,000 characters a day total. On heavy grading sessions where you iterate paste, score, rewrite, repaste across many essays, GPTZero free has more headroom before you bump into a paywall on the day.
The perplexity and burstiness approach was published openly by Edward Tian and the GPTZero team during the company's Princeton origin in 2023. You can read the original methodology, cite it in your honour-code writeup, and defend it on technical grounds in front of a department head. That documentation depth genuinely matters in an integrity hearing.
For district-wide buying with deep Canvas, Schoology, or Blackboard sync, GPTZero Origin is the more mature integration with formal LMS hooks, batch upload, and admin dashboards. TextSight's Chrome extension suits individual teachers better but is not a procurement-tier sync. If your school is buying for the department, Origin is the maturer enterprise choice today.
Five specific reasons individual teachers run TextSight as their daily classroom tool, even in schools where GPTSero is the official brand.
Picture the meeting. A student has been flagged. The parent is in the room. The administrator asks you what evidence you have. If your only answer is the detector said seventy percent AI, you have already lost the conversation. With TextSight, you point to four specific sentences and ask the student how they came up with those phrasings. Five colour-graded bands (Original, Mostly Human, Mixed, Likely AI, AI Generated) are included free, on every scan. GPTZero limits highlight granularity on the free tier.
This is the most important sentence on this page. No detector is reliable on ESL student writing. Students who learned English in school, who write with restricted vocabulary and careful structure, get flagged as AI because their burstiness is low. TextSight is explicitly tuned against ESL writing samples and on our internal benchmark of 2,400 student essays produces around 40 percent fewer false positives than detectors not calibrated for that register. GPTZero has acknowledged the ESL false-positive risk publicly. Both are imperfect, but the calibration gap is real.
Select the suspicious paragraph on the Classroom or Canvas submission page, click the extension icon, see the Authenticity Score and sentence highlights inline. No tab switching, no copy-paste, no document upload. Ships with the same sentence highlights as the web app. GPTZero offers Origin for Educators with deeper LMS sync but at the paid education tier with district approval cycles. For the individual teacher who just wants to scan a suspicious paragraph without leaving Classroom, the free TextSight extension is the lower-friction path.
TextSight Pro at $19.99 a month (or $13.99 a month with verified .edu) handles bulk file upload through the dashboard with sentence-level highlights preserved per essay and a 90-day audit history. GPTZero Premium and Origin offer batch upload at higher price tiers with no .edu discount. For a teacher buying personally on a public-school salary, the dollar gap matters and the .edu signal matters more.
Every scan you run on TextSight Pro is kept for 90 days with highlights intact, so you can show your department head or principal exactly what the detector saw before you raised the concern. Deletable on demand if district policy requires it. Submitted text is never used to train detector models. For teachers who may need to defend a referral later, the audit trail is worth the subscription on its own.
Use this as a quick decision matrix for the most common teacher workflows. If your situation is mixed, run both, in the order shown.
Pick TextSight first. ESL-aware classifier flags around 40 percent fewer false positives, which matters most when the cost of being wrong is a wrongful accusation against a non-native student.
Try TextSight free →Pick TextSight Pro at $13.99 with .edu. Unlimited scans, bulk class upload, 90-day audit history, free Chrome extension for Classroom. GPTZero only worth the gap if your district already approved it.
Get Pro →Free tiers from both, run in sequence, cost nothing. TextSight first for sentence-level evidence and the inline Chrome scan. GPTZero second as a second-classifier sanity check.
Start free →GPTZero Origin for Educators is the maturer LMS sync today. TextSight Pro is the better-priced personal tool. Run a pilot with both on one section before signing a contract.
See Pro →If you can only pick one, here is the call. If you can run both, here is the order.
Pick TextSight as the daily classroom tool: sentence-level highlights for defensible conversations, free Chrome extension for Classroom and Canvas, 10,000 characters a day free, ESL-aware classifier with around 40 percent fewer false positives on non-native writing, .edu Pro at $13.99 a month, bulk class scan with 90-day audit history. Best fit for individual teachers paying out of pocket who want evidence to point to, not just a percentage.
Use GPTZero when: your district already approved it, you need brand recognition in a defensive meeting, your school is evaluating procurement-tier Origin for Educators LMS sync, or your committee specifically trusts the published Burstiness and Perplexity methodology. Brand familiarity is part of the evidence package in integrity proceedings, and that genuinely matters.
One-line answer: choosing for yourself, TextSight has the sentence-level evidence, the free extension, the ESL calibration, and friendlier pricing. Choosing for a committee, GPTZero has the brand. Either way, no detector should be sole evidence. The score starts the conversation, your judgement ends it.
Internal benchmark of 100 passages per condition. TPR is true-positive rate on AI-generated essays. FPR is false-positive rate on human-written essays. Lower FPR is better; higher TPR is better. ESL FPR is the column that decides classroom safety.
| Tool | GPT-4 TPR | Claude TPR | Native FPR | ESL FPR | Combined |
|---|---|---|---|---|---|
| TextSight | 92% | 90% | 3% | 6% | 91% / 4.5% |
| GPTZero | 89% | 86% | 5% | 22% | 88% / 13.5% |
| Copyleaks | 94% | 92% | 4% | 16% | 93% / 10% |
| Originality | 95% | 93% | 4% | 19% | 94% / 11.5% |
| Quillbot | 86% | 83% | 8% | 14% | 84.5% / 11% |
| ZeroGPT | 85% | 82% | 6% | 21% | 83.5% / 13.5% |
| Grammarly | 80% | 77% | 7% | 20% | 78.5% / 13.5% |
The bulk class workflow looks like this: open Google Classroom, work through thirty submissions, and decide which two or three to flag. The ESL FPR column is where the safety calculation lives. On TextSight, an ESL FPR of 6% means roughly two essays in a thirty-essay class might be mis-flagged. On GPTZero with an ESL FPR of 22%, that rises to roughly seven essays in the same class, with the cost falling disproportionately on non-native English students who write more formally because that is how they were taught. For a teacher with three sections of thirty, the difference compounds into a different week of conversations.
A 70% overall score on one essay is not enough to start an integrity conversation. The teacher needs to point to specific sentences and ask the student to talk through their drafting process. TextSight surfaces five-band sentence highlights on every scan including the free tier, so even before you upgrade you can show the parent and student exactly which four lines the classifier weighted highest. GPTZero exposes burstiness and perplexity scores and offers highlights on its paid tier, but free-tier granularity is limited and the conversation tends to default to the overall percentage. For the daily integrity conversation, sentence-level evidence on the free tier wins.
Teachers working within FERPA and district policy need an audit trail that is deletable on demand. TextSight Pro keeps a 90-day audit history with highlights intact per scan, deletable on request, and submitted text is never used to train detector models. GPTZero publishes a similar non-training stance in its privacy policy, with district customers reviewing a full DPA at procurement time. Strip student identifiers before scanning where district policy requires it, and document the scan in the same record where you document the conversation that followed; the score starts the dialogue, your judgement closes it.
All-audience deep comparison, with feature parity matrix and the cross-check workflow.
See the full vs page →Seven-tool ranking with classroom integration, false-positive rates, and .edu pricing side by side.
See the ranking →The classroom feature set, bulk class scan, and the pre-Turnitin conversation workflow.
Read the guide →The classroom workflow, .edu discount details, and the policy-friendly framing.
See the teacher hub →Free to try. No card. Sentence-level evidence, ESL-aware scoring, free Chrome extension for Classroom, and a .edu Pro price of $13.99 a month when you upgrade.