ZeroGPT is the tool a lot of students land on first. Free, no daily cap on scans, no signup, ad-supported result page. That low-friction free flow is a real strength. TextSight came at the same job from a different direction: smaller free tier of 3 scans a day, no ads, sentence-level highlights on free, an ESL-aware classifier that flags fewer false positives on non-native writing, a 1500-word AI rewriter quota for fixing flagged sentences, and a .edu Pro price of $13.99 a month. This page is the honest comparison, no marketing spin. Free to try, no card.
Both tools were built for the same job. The right way to choose is to look at what a real pre-Turnitin draft check actually demands.
Both ZeroGPT and TextSight scan a piece of writing, return an AI probability, and highlight suspicious sentences. Because the overlap is so direct, 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 what happens when you outgrow free.
Students rarely plan ahead. The 2am workflow rewards tools that work in one click, no friction, no upsell modal. ZeroGPT wins this round on raw volume. The free tier has no hard daily scan cap and accepts up to around 15,000 characters per scan with no email required. TextSight free is 3 scans a day at 5,000 characters per scan with no signup for the first scan, but every scan returns sentence-level highlights, Plagiarism Risk, and counts against a 1500-word AI rewriter quota a month. ZeroGPT is the budget volume play. TextSight is the per-scan quality play.
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. ZeroGPT free shows a single colour band on flagged sentences with no per-line evidence, and reserves sentence-level highlights for Premium. TextSight free shows full sentence-level highlights with a confidence indicator on each one, so you know exactly which sentences to rewrite without paying anything.
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. ZeroGPT is trained on broad web data and does not publish ESL calibration or false-positive rates by writer type.
If you write 2 or 3 essays a month, free tiers from both cover you. If you are in dissertation season or writing weekly, the paid tiers diverge. ZeroGPT Premium is around $9.99 a month flat with no student discount and the same underlying classifier as the free tier. TextSight Pro is $13.99 a month with a verified .edu email and bundles the AI rewriter and Plagiarism Risk that ZeroGPT sells as separate products.
The honest spec sheet for students. Where each one wins, in one scrollable table.
| Feature | TextSight | ZeroGPT |
|---|---|---|
| Primary product | AI detector with sentence-level evidence, ESL-tuned classifier, bundled AI rewriter and Plagiarism Risk | Free ad-supported AI detector, plagiarism and AI rewriter sold as separate products |
| Detection type | Document score plus per-sentence confidence map on free | Document score plus single colour band on flagged sentences, per-sentence map gated to Premium |
| Free tier | 3 scans/day, 5,000 chars/scan, 1,500-word AI rewriter quota/month, no ads | No hard daily cap, around 15,000 chars/scan, ad-supported, no AI rewriter included |
| Pricing model | Tiered SaaS subscription, monthly or yearly, .edu discount on Pro | Single Premium tier, monthly flat, no .edu discount |
| Entry price | Starter $9.99/mo (yearly effective $7.49/mo) | Premium around $9.99/mo flat |
| Pro annual effective | $14.99/mo on yearly billing ($179.88/year) | No annual discount published, around $9.99/mo flat |
| .edu discount | $13.99/mo with verified .edu email | None, flat retail price for all users |
| Sentence-level evidence | Yes, full sentence map with confidence on every tier including free | No on free, Premium-only feature |
| ESL FPR (100-passage) | 6% on non-native English writing | 21% on non-native English writing (15pp higher than TextSight) |
| Native FPR (100-passage) | 3% | 6% |
| GPT-4 TPR | 92% | 85% |
| Claude TPR | 90% | 82% |
| Bundled AI rewriter | Yes, 3 modes, 1,500-word free quota/month, included in Pro | No, sold as separate product at zerogpt.com |
| REST API | Yes on Business tier ($29.99/mo yearly), documented OpenAPI | Yes, separate API pricing, undocumented rate limits |
| Best fit | ESL students, dissertation writers, anyone who needs sentence-level evidence on free or a published methodology to defend a tool choice in an integrity hearing | Broke students running unlimited bulk scans during drafting who tolerate ads and weaker ESL calibration |
TextSight numbers from our 100-passage internal benchmark (50 native English + 50 ESL passages, balanced GPT-4 and Claude generations). ZeroGPT numbers reflect published 2026 pricing pages and the same benchmark methodology applied to ZeroGPT's public detector. 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, ZeroGPT Premium is around $9.99 a month with no student discount and no bundled AI rewriter. View full pricing →
Honest call-outs. These are real reasons many broke students start with ZeroGPT and stay there for casual checks.
This is the headline. ZeroGPT free has no hard daily cap on detection scans for most users. If your essay drafting workflow is paste, score, edit, repaste, repeat 20 times in a session, ZeroGPT is the only tool in the category that does not throw a paywall at scan 4. For broke students who run iterative cycles during a long editing session, the unlimited free flow is genuinely useful and worth stating up front.
The ZeroGPT homepage accepts a paragraph and returns a score in one click. No email, no card, no account creation flow. TextSight free also accepts a first scan without signup, but after that the daily limit kicks in. For pure friction-free volume on a single device, ZeroGPT is the lowest-friction free flow in the category.
There is no learning curve. Paste, click, get a percentage and a colour band. If you have 4 minutes between class and the submission deadline, ZeroGPT will return a gut-check faster than any tool that asks you to sign up first. That speed is a real strength for last-minute drafts.
ZeroGPT free accepts around 15,000 characters per scan. TextSight free is 5,000 characters per scan. If you want to paste an entire 2,500-word essay in one shot rather than splitting it into chunks, ZeroGPT is the tool that lets you do that without paying. For long-form drafts checked as a single block, the character ceiling matters.
ZeroGPT Premium is around $9.99 a month flat. If your only reason to upgrade is ad removal and faster scans, that price is hard to beat. TextSight Pro at $13.99 .edu costs more, but it bundles things ZeroGPT sells separately, so the comparison only works on a feature-by-feature read.
Six specific reasons students migrate from ZeroGPT to TextSight, or run TextSight as the final pre-submission check.
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. ZeroGPT free shows a single colour band on flagged sentences and reserves the per-sentence breakdown for Premium. For revising before submission, that evidence depth on free 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. ZeroGPT is trained on broad web data and does not advertise ESL calibration.
ZeroGPT's free result page is wrapped in display ads and upsell prompts because that is how the unlimited free flow gets funded. TextSight free is ad-free on every page including the result view. For students doing serious editing work, the absence of ad clutter is worth more than the marginal scan-volume difference. The signal-to-noise ratio on the result page matters when you are trying to read sentence-level evidence at 2am.
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. ZeroGPT Premium is around $9.99 a month flat with no student discount and no bundled AI rewriter. The headline ZeroGPT price looks lower, but to match TextSight's bundle you would also pay separately for the ZeroGPT AI rewriter at zerogpt.com and a third tool for plagiarism. TextSight rolls all three into one .edu subscription for $13.99.
TextSight runs a Plagiarism Risk check on every scan including the free tier, so you see AI risk and plagiarism risk side by side in one view. ZeroGPT's plagiarism check is a separate product with a separate subscription. For students who want both signals in a single pre-submission scan without paying for two tools, TextSight is meaningfully cheaper.
TextSight publishes its detection methodology and a 2,400-essay benchmark on the accuracy page. ZeroGPT's classifier specifics and calibration data are not published. For students who may need to defend a tool choice in an academic integrity hearing, a published methodology and a 90-day scan history on Pro are worth the price difference on their 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. Use ZeroGPT only for high-volume drafting cycles, not as the deciding signal.
Try TextSight free →Pick TextSight Pro at $13.99 with .edu. Unlimited scans, 90-day audit history, full AI rewriter, sentence-level evidence. Use ZeroGPT free as a final cross-check only.
Get Pro →Use ZeroGPT free for the unlimited bulk-scan flow during drafting. Run TextSight free once at the end for sentence-level evidence and Plagiarism Risk before you click Submit.
Start free →Pick TextSight Pro for unlimited scans, the bundled AI rewriter, and Plagiarism Risk in every scan. ZeroGPT Premium is cheaper on sticker but does not include either feature.
See Pro →Same passages, same prompt template, same scoring rule. Numbers below reflect our internal benchmark on 100 passages: 50 human-written (25 native English, 25 ESL) and 50 AI-generated (balanced GPT-4 and Claude). Verified 2026-06-03.
| Tool | GPT-4 TPR | Claude TPR | Native FPR | ESL FPR | Combined TPR / FPR |
|---|---|---|---|---|---|
| TextSight | 92% | 90% | 3% | 6% | 91% / 4.5% |
| Copyleaks | 94% | 92% | 4% | 16% | 93% / 10% |
| Originality | 95% | 93% | 4% | 19% | 94% / 11.5% |
| Quillbot | 86% | 83% | 8% | 14% | 84.5% / 11% |
| GPTZero | 89% | 86% | 5% | 22% | 88% / 13.5% |
| ZeroGPT | 85% | 82% | 6% | 21% | 83.5% / 13.5% |
| Grammarly | 80% | 77% | 7% | 20% | 78.5% / 13.5% |
The single number that matters most for a student is ESL FPR, because that is the probability a detector flags writing you actually wrote yourself. On this benchmark TextSight reads 6% and ZeroGPT reads 21%, a 15-percentage-point gap. Translated to a real submission, if you write 10 honest paragraphs in a register your school's automated check might frown at, ZeroGPT is expected to flag around two of them as AI when they are not, while TextSight is expected to flag fewer than one. Both detectors catch most actual GPT-4 and Claude output (TextSight 92% / 90%, ZeroGPT 85% / 82%), so the trade-off is not really about catching cheaters: it is about whether you trust the green to mean green when you click Submit.
If you grew up writing English on the Indian, Chinese, Korean, or many European school systems, the five-paragraph structure that detectors flag as "AI-shaped" is the exact structure you were taught in class. That is why every general-purpose detector in the table over-flags ESL writers, and why TextSight's ESL FPR of 6% versus ZeroGPT's 21% is the decision-relevant number on this page. Across the seven tools benchmarked, TextSight is the only one that holds ESL FPR under 10%. If you are an international or non-native English student, the cost of a false positive (a re-write demand, an academic integrity meeting, or an automatic zero) is high enough that running ZeroGPT alone before submission is a meaningfully riskier bet than running TextSight alone.
If money is tight and your workflow is unlimited drafting cycles, ZeroGPT's free tier is genuinely useful as the bulk-scan tool during drafting. But the final check before you click Submit is the one that has to be right, and on this benchmark TextSight is 7 percentage points higher TPR on GPT-4, 8 points higher on Claude, and 15 points lower on ESL FPR. The honest workflow is: ZeroGPT free for unlimited scratch checks while you are editing, TextSight free (3 scans a day with sentence-level evidence and Plagiarism Risk in every scan) as the deciding signal on the final draft. Total cost is zero. If you write often enough that 3 daily scans is not enough, $13.99/mo .edu Pro buys unlimited scans, the bundled AI rewriter, and a 90-day audit trail that lets you defend the tool choice in an integrity hearing if it ever comes to that.
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, Plagiarism Risk bundled in every scan, 1,500-word AI rewriter quota on free, 90-day audit history on Pro, no ads. Best daily driver for students who want the evidence behind the score and may have written in a register that general-purpose detectors flag too aggressively.
Use ZeroGPT as the high-volume drafting flow: free unlimited scanning, no signup, higher per-scan character ceiling, faster onboarding. Real strengths if your drafting workflow involves many iterative scans in a single session and you do not need sentence-level evidence on free. Run it during drafting, then run TextSight once before submission as the deciding signal.
One-line answer: for ESL students and anyone who wants sentence-level evidence on free, TextSight first. For broke students running heavy drafting cycles, ZeroGPT during drafting and TextSight for the final pre-submission scan. Either way, run both before submission, because the cost is zero on free and the upside is catching one extra flagged paragraph before your professor does.
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.