GPTZero is the free academic standard most students and professors already recognise. TextSight is the newer pick with sentence-level highlights on the free tier, an ESL-aware classifier that flags fewer false positives on non-native writing, and a .edu Pro price of $13.99 a month. Pre-Turnitin draft check, head to head, no marketing spin. Free to try, no card.
Both products were built for the same job. The right way to choose between them is to look at what a real pre-Turnitin draft check demands.
Both GPTZero and TextSight scan a piece of writing, return an AI probability, and highlight suspicious sentences. Because they overlap so directly, the comparison comes down to four things students care about: free-tier generosity, how the evidence is shown, how non-native English is handled, and how much the paid tier costs once you outgrow free.
Students rarely plan ahead. The 2am workflow rewards tools that work in one click, no friction, no upsell modal. GPTZero gives more scans a day on free after signup. TextSight gives sentence-level highlights and Plagiarism Risk on free, with no signup required for the first scan and 2 free AI rewriter uses for fixing flagged sentences.
A document-level score without sentence-level highlights is hard to act on. You see the score is 62 but you do not know which sentences are pulling it down. GPTZero free shows a basic colour band. TextSight free shows full sentence-level highlights with a confidence indicator on each one, so you know exactly which sentences to rewrite.
Formal English instruction in Indian, Chinese, Korean, and many European schools teaches the same five-paragraph essay structure that ChatGPT defaults to. Detectors not calibrated for ESL register over-flag these students for essays they wrote themselves. TextSight is explicitly tuned for this. GPTZero is general-purpose and does not advertise ESL calibration.
If you write 2 or 3 essays a month, free tiers from both cover you. If you are in dissertation season or writing weekly, you will outgrow free. GPTZero Premium is around $14.99 a month with no student discount. TextSight Pro is $13.99 a month with a verified .edu email and bundles the AI rewriter that GPTZero sells as a separate Origin subscription.
The honest spec sheet for students. Where each one wins, in one scrollable table.
| Feature | TextSight | GPTZero |
|---|---|---|
| Primary product | AI detector with sentence-level evidence and bundled AI rewriter | Academic AI detector with perplexity plus burstiness classifier |
| Detection type | Multi-signal classifier, sentence-level confidence | Perplexity plus burstiness, document-level band |
| Free tier | 3 scans/day, 5,000 chars/scan, sentence highlights, no signup for first scan | ~10 scans/day after signup, 10,000 chars/scan, basic colour band |
| Pricing model | Free, Starter, Pro, Business with monthly or yearly billing | Free and Premium with flat retail pricing |
| Entry price | Starter $9.99/mo monthly, $7.49/mo yearly | Premium $14.99/mo flat |
| Pro annual effective | $14.99/mo (Pro yearly, $179.88/yr) | $14.99/mo (Premium, no yearly discount published) |
| .edu discount | Yes, Pro $13.99/mo with verified .edu email | No formal .edu discount on Premium |
| Sentence-level evidence | Yes, per-sentence confidence on free and paid | Document-level band on free, sentence highlights on Premium |
| ESL FPR (100-passage) | 6% (16pp below GPTZero) | 22% |
| Native FPR (100-passage) | 3% | 5% |
| GPT-4 TPR (100-passage) | 92% | 89% |
| Claude TPR (100-passage) | 90% | 86% |
| Bundled AI rewriter | Yes, 3 modes, 1,500-word free monthly quota | No, Origin is sold as a separate product |
| REST API | Yes, included on Business at $29.99/mo yearly | Yes, separate API plan with usage pricing |
| Best fit | ESL students, dissertation writers, anyone who wants sentence evidence on free | Students whose professor already trusts the GPTZero brand for cross-checking |
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 student discount. View full pricing →
Honest call-outs. These are real reasons many students stick with GPTZero, especially if they were already using it before TextSight existed.
GPTZero is the AI detector that landed in the New York Times, the BBC, NPR, and pretty much every back-to-school explainer your professor has read. If you tell your instructor you ran your essay through GPTZero and it came back clean, they know what you mean. That credibility matters if you ever end up defending your work in an academic integrity meeting.
The GPTZero extension has been on the Chrome Web Store since 2023 and is genuinely well-built. You can select text inside Google Docs, Notion, or Gmail and scan it in two clicks without leaving the page. TextSight ships a Chrome extension too, but GPTZero's is more polished and has the larger install base.
GPTZero free gives around 10 scans a day at 10,000 characters per scan after a quick signup. TextSight free gives 3 scans a day at 5,000 characters per scan. If you run iterative cycles of paste, score, rewrite, repaste during a long editing session, GPTZero's higher daily allowance lets you go longer before hitting a paywall.
GPTZero advertises explicit coverage of ChatGPT, GPT-4, Claude, Gemini, LLaMA, and a wide set of newer models, with classifier updates published as new models ship. TextSight retrains regularly against current ChatGPT, Claude, and Gemini, but does not advertise the same breadth of named model support.
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 academic work, and defend it on technical grounds. That documentation depth is genuinely useful if you ever need to justify your tool choice in a hearing.
Five specific reasons students migrate from GPTZero to TextSight, or run TextSight first in their cross-check workflow.
When TextSight flags your essay at 62, the colour map shows you exactly which sentences scored worst, with a confidence indicator on each one. You see the evidence behind the score, not just the score itself. GPTZero free shows a basic colour band on the document but does not give you the same per-sentence confidence breakdown. For revising before submission, that evidence depth is the difference between guessing what to fix and knowing.
This is the big one for international and non-native English students. Formal English instruction in Indian, Chinese, Korean, and many European schools teaches the same five-paragraph structure that ChatGPT defaults to, which means detectors not calibrated for ESL register over-flag students for essays they wrote themselves. TextSight is explicitly tuned against ESL writing samples, and in our internal testing on 2,400 student essays it produces around 40 percent fewer false positives on non-native English than detectors that are not. GPTZero is general-purpose and does not advertise ESL calibration.
TextSight Pro is $19.99 a month standard, $14.99 a month on annual billing, and $13.99 a month with a verified .edu email. GPTZero Premium is around $14.99 a month flat with no student discount. The dollar matters less than the signal: TextSight built explicit pricing for students, GPTZero charges the same retail rate whether you are a Fortune 500 editor or a sophomore on a meal plan.
A flagged paragraph without an action plan is just anxiety. TextSight free includes a 1,500-word AI rewriter quota a month, which is enough to fix the flagged sentences in 2 or 3 typical student essays without paying for anything. GPTZero has no integrated AI rewriter; the equivalent product is Origin, sold separately. Same workflow on TextSight, fewer tabs, lower detector residue, no second subscription.
Every scan you run on TextSight Pro is kept for 90 days with the highlights intact, so you can show your supervisor or thesis committee exactly what the detector saw before you submitted. GPTZero keeps a scan history too, but it is less prominent in the student-tier UI. For dissertation students and anyone who may need to defend a submission later, the audit trail is worth the price difference on its own.
Use this as a quick decision matrix for the most common student 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. Cross-check with GPTZero only if your professor specifically asks.
Try TextSight free →Pick TextSight Pro at $13.99 with .edu. Unlimited scans, 90-day audit history, full AI rewriter, sentence-level highlights. Use GPTZero free as a final cross-check.
Get Pro →Free tiers from both, run in sequence, cost nothing. Start with TextSight for sentence-level evidence, finish with GPTZero free for the second-classifier cross-check.
Start free →Pick TextSight Pro for unlimited scans and the bundled AI rewriter. GPTZero Premium is competitive on price but does not include AI rewriter or .edu pricing.
See Pro →If you can only pick one, here is the call. If you can run both, here is the order.
Pick TextSight as primary: sentence-level evidence on free, ESL-aware classifier with around 40 percent fewer false positives on non-native writing, $13.99 a month .edu Pro pricing, free AI rewriter quota for fixing flagged sentences, 90-day audit history on Pro. Best daily driver for students who want the evidence behind the score, not just the score, and who may have written in a register that general-purpose detectors flag too aggressively.
Use GPTZero as the cross-check: independent perplexity plus burstiness algorithm, broader advertised LLM model coverage, mature Chrome extension, brand recognition with professors, higher daily free quota. Run it after TextSight as a second-classifier sanity check. Two independently trained detectors both reading green is meaningfully stronger than either one alone, and that is the workflow students with the lowest flag rates on submission actually run.
One-line answer: for ESL students and anyone who wants sentence-level evidence, TextSight first. For students whose professor already specifically trusts GPTZero, GPTZero first, then TextSight as the second opinion. Either way, run both before submission, because the cost is zero and the upside is catching one extra flagged paragraph before your professor does.
True-positive and false-positive rates across the seven detectors students actually consider. Native and ESL columns split because the gap matters most for international writers.
| 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 single most expensive moment in the student workflow is the one between finishing a draft and hitting submit. Once Turnitin or your school's AI checker flags a paragraph, the conversation moves from your essay to your integrity. Running a pre-submission scan on TextSight surfaces the at-risk sentences with per-sentence confidence so you can rewrite only what needs rewriting, instead of guessing which paragraphs the school detector will flag. Running GPTZero second as a sanity check costs nothing on the free tier and gives you a second classifier reading on the same passage.
For Indian English, Chinese, Korean, and many European-trained students, the dominant risk is being flagged for an essay you wrote yourself, because formal English instruction teaches the same five-paragraph structure that ChatGPT defaults to. The ESL FPR column above is the only column that actually matters here. TextSight at 6% means roughly 6 honestly-written essays in 100 get a false-positive flag. GPTZero at 22% means roughly 22 in 100. The 16-percentage-point gap is the reason ESL students should run TextSight first and treat any GPTZero flag with scepticism unless TextSight also reads red.
For one or two essays a month, the free tiers from both products cover the workflow at zero cost. The decision point is dissertation season and weekly-essay-load students. TextSight Pro at $13.99 a month with a verified .edu email is the lowest paid-tier price in the student-detector category, includes unlimited scans, 50,000 AI rewriter words a month, and a 90-day audit history. GPTZero Premium at $14.99 a month with no student discount is competitive on raw price but does not bundle the AI rewriter or surface a .edu rate. If you are submitting weekly, the .edu Pro plan pays for itself in 1 caught false positive.
All-audience deep comparison, with feature parity matrix and the cross-check workflow.
See the full vs page →Seven-tool ranking with Turnitin correlation, false-positive rates, and .edu pricing side by side.
See the ranking →The pre-scan workflow that catches Turnitin flags before your professor does.
Read the guide →The student workflow, .edu discount details, and the academic tone preset.
See the student hub →Free to try. No card. Sentence-level evidence, ESL-aware scoring, and a .edu Pro price of $13.99 a month when you upgrade.