Your job is not pre-scanning one essay before a deadline. It is triaging a class, fairly, with evidence you can actually put in front of a student. GPTZero is the detector your colleagues and administrators already recognise, with the original perplexity plus burstiness methodology and Canvas and Google Classroom integration on its Professional plan. TextSight is the newer classroom pick: sentence-level highlights from Starter so a conversation starts from specific lines, a published false-positive benchmark that found no significant gap between second-language and native writers, bulk class file upload on Pro, and a free Chrome extension for Google Classroom. 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 from Starter so you can point to specific lines, not just a single percentage; the free tier gives one overall score.
Formal English instruction in Indian, Chinese, Korean, and many European schools teaches the same tidy, low-variance structure that AI models default to. Detectors not calibrated for that register over-flag students for essays they wrote themselves, and the same pattern hits STEM lab reports and strict APA writing. TextSight is tuned to read that register as Mixed rather than Likely AI more often, and shows the sentence evidence so you can judge each flag. GPTZero is general-purpose and has acknowledged ESL false-positive risk publicly. No detector is reliable enough to settle an ESL case on its own.
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 also offers a Canvas and Google Classroom integration; its pricing page shows which plan includes it. What works inside Classroom today, tool by tool, is in Google Classroom AI detection.
Most K-12 teachers pay personally. District reimbursement cycles take months. TextSight Pro is $19.99 a month standard and $14.99 a month on annual billing, with a free tier that covers most single-class workflows. GPTZero Premium is sold either month to month or on annual billing at a lower per-month rate, about 46 percent lower on the rates GPTZero published when we checked, and GPTZero prices by region, so read its pricing page for the figure you would actually pay.
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 Humanization 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 + Professional, each paid tier monthly or annual, plus Enterprise and Team through sales |
| Entry price | Starter $9.99/mo or $7.49/mo yearly | Premium is the entry paid tier, with a monthly rate and a lower annual rate, priced by region |
| Pro annual effective | $14.99/mo (billed $179.88/year) | Premium has a monthly rate and an annual rate about 46% lower per month; priced by region, see GPTZero's pricing page |
| Sentence-level evidence | One overall score on free; full 5-band highlights from Starter (Original to AI Generated) | Limited granularity on free; full highlights on paid |
| Non-native English handling | Tuned to read formal ESL prose as Mixed rather than Likely AI more often | General-purpose; has acknowledged ESL false-positive risk publicly |
| Bulk class workflow | Bulk file upload on Pro, highlights kept per essay, full history | Batch upload on Premium (up to 50 files) and Professional (up to 250 files) |
| Classroom integration | Free Chrome extension for inline Classroom and Canvas scans | Canvas and Google Classroom integration on the Professional plan |
| Data handling | Submitted text not used to train models; history deletable on demand | States submissions not used to train; district DPA at procurement |
| REST API | Yes, on Business tier ($29.99/mo yearly) | Yes, on separate API plans sold through sales |
| Best fit | Teachers who want defensible sentence evidence and ESL-fair triage | Districts that need a recognised brand and Professional-plan LMS integration |
Feature and pricing details reflect each tool's public pages. Verify current pricing on the vendor pricing page before committing to a paid plan.
Yearly billing saves 63 percent. Full details on the pricing page.
For comparison, GPTZero sells Premium and Professional, each with a monthly rate and a lower annual rate, priced by region, so check GPTZero's own pricing page for the figure you would pay. 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's free tier gives a higher daily scan allowance than TextSight free's 3 scans a day. On a Sunday-night grading marathon where you are checking many essays back to back, that extra headroom means fewer interruptions before you hit a paywall for the day. For a teacher who triages in bursts rather than constantly, that can be the deciding practical detail.
GPTZero's perplexity and burstiness approach was published openly during the company's Princeton origin in 2023. When you write up a referral, being able to name and cite a documented method, rather than a black-box score, strengthens your case in front of a department head or integrity committee. That paper trail is part of why many schools standardised on GPTZero in the first place.
For a school buying centrally, GPTZero's Professional plan carries the Canvas and Google Classroom integration, batch upload of up to 250 files, and page-by-page scanning, and its Enterprise and Team plans add shared team credits and unified billing through its sales team. TextSight's Chrome extension suits individual teachers better but is not a procurement-tier sync. If your school is buying for the department, GPTZero's Professional and Team plans are the maturer route 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. Sentence highlights in five colour-graded bands (Original, Mostly Human, Mixed, Likely AI, AI Generated) start on Starter; the free tier gives one overall score per scan. GPTZero limits highlight granularity on the free tier.
This is the most important paragraph on this page. No detector is reliable on ESL student writing. Students who learned English in school, who write with careful structure and a smaller vocabulary, get flagged because their sentence variance is low, not because they cheated. TextSight is tuned to read that register as Mixed rather than Likely AI more often, and it surfaces the per-line evidence so you can look at exactly what the classifier reacted to before you say anything to the student. GPTZero has acknowledged the ESL false-positive risk publicly. Both tools are imperfect here, which is why the sentence evidence, not the headline number, is what should drive a fair classroom decision.
Select the suspicious paragraph on the Classroom or Canvas submission page, click the extension icon, see the Humanization 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 a deeper LMS sync, but it sits on the Professional plan, the higher of its two self-serve paid tiers. 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 $14.99 a month on annual billing, handles bulk file upload through the dashboard with sentence-level highlights preserved per essay and a full audit history. GPTZero caps batch upload at 50 files on Premium and 250 files on Professional. For a teacher buying personally on a public-school salary, read GPTZero's monthly and annual rates for your region before you compare.
Every scan you run on TextSight Pro is kept with highlights intact until you delete it, 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 shared or sold, and never used to train our 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 for its measured false-positive rate and per-line evidence, which matters most when the cost of being wrong is a wrongful accusation against a non-native student. Let the sentence evidence, not the score, drive the call.
Try TextSight free →Pick TextSight Pro for 100 actions a day, bulk class upload, full audit history, and the free Chrome extension for Classroom. GPTZero is the pick mainly 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's Professional plan carries the maturer LMS integration today. TextSight Pro is the simpler personal purchase, with bulk upload and full history. 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 (Starter and up) for defensible conversations, a free Chrome extension for Classroom and Canvas, 3 scans a day free, a published false-positive benchmark that found no significant gap between second-language and native writers, and bulk class file upload with full history on Pro. 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 the LMS integration on GPTZero's Professional plan, 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, a published false-positive rate, 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.
All-audience deep comparison, with feature parity matrix and the cross-check workflow.
See the full vs page →Seven-tool ranking with classroom integration and false-positive rates 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 and the policy-friendly framing.
See the teacher hub →Free to try. No card. Sentence-level evidence, a published false-positive rate, and a free Chrome extension for Classroom.
Honest head-to-heads with other detectors and humanizers.