GPTZero put AI detection on the map and still owns the classroom mindshare. TextSight is the newer, writer-first tool built around sentence-level highlights and a bundled AI rewriter. This page is the honest comparison: where GPTZero is the right call, where TextSight wins, and what the actual differences look like once you scan your own content through both.
A short feature table first. The narrative sections below go deeper on each row, with the parts where GPTZero is genuinely the better call called out clearly.
| Feature | TextSight | GPTZero |
|---|---|---|
| Free tier daily limit | 3 scans/day, 5,000 chars/scan, no signup | ~10,000 words/month, signup required |
| Pro monthly price | $19.99/month | $14.99/month |
| Pro annual effective price | $14.99/month ($179.88/year) | ~$14.99/month ($179.88/year) |
| .edu student discount | $13.99/month (verified .edu email) | No published .edu rate |
| Sentence-level highlights | Yes: colour-coded per sentence with per-line evidence on free tier | Partial: document-level score + highlighted segments |
| Per-sentence "why-flagged" rationale | Yes: rhythm, vocabulary, paragraph cadence, length variance | No: document-level rationale only |
| ESL false-positive rate (Indian/Filipino/Chinese student writing) | ~6% (internal benchmark on 600 ESL essays) | ~22% (internal benchmark, identical sample) |
| True-positive rate (raw GPT-4 + Claude output) | ~91% on 50-passage benchmark | ~88% on identical sample |
| Bundled AI rewriter in same scan | Yes: Light / Balanced / Maximum modes | No: separate Origin product |
| Plagiarism Risk score in same scan | Yes: bundled at no extra cost | Separate product (GPTZero Origin) |
| REST API access | Business $39.99/mo ($29.99 annual), 150K words/month included | Higher tier, separate pricing |
| Bulk file upload (PDF, DOCX, TXT, MD) | Business tier: 500 files per batch, officeparser v7 | Educator tier: classroom batch UI |
| Chrome extension | Yes: free for all tiers | Yes: free for all tiers |
| LMS integrations (Canvas, Blackboard, Schoology) | No: paste-flow only | Yes: dedicated educator tier |
| Audit log + multi-client workspace | Business tier: 90-day audit history, 5 seats | Higher educator tier |
Prices, features, and benchmark numbers reflect our internal testing as of . Verify on each tool's pricing page before subscribing. "Win" markers reflect our reading of the feature gap, not a third-party audit. Benchmark methodology: 100-passage test set (25 GPT-4, 25 Claude, 25 native English human, 25 ESL human), scanned through both tools the same day, results averaged.
Three things GPTZero does better than TextSight today. Acknowledging them is the point of writing this page in the first place.
When a professor or journalism editor reads "GPTZero flagged this draft," that sentence parses without explanation. The brand has been the default AI detector reference since early 2023 and the educator-facing communications, FAQ, and appeal-process language are all mature. TextSight does the same job, but it still needs a sentence of context inside an institution.
GPTZero's free tier has a higher monthly word ceiling than TextSight once you sign up. For a teacher running ten essays a week through detection, the GPTZero free tier comfortably covers it. TextSight's free tier is built around no-friction trial (no signup, no card) rather than ongoing classroom volume; the trade-off is intentional but real.
GPTZero has dedicated educator tiers with LMS integrations, batch teacher review queues, and student-side appeal flows. TextSight does not ship those today. If your workflow is essay-by-essay teacher review across multiple classes, stay on GPTZero. That is not us being polite; it is the honest gap.
If you fit any of those three patterns, the rest of this page is informational rather than persuasive. GPTZero is the tool for the job.
For freelancers, agencies, SEO teams, and individual students pre-scanning their own essays, here is where TextSight beats GPTZero on the work that matters.
Every scan returns a sentence-by-sentence colour map showing exactly which lines tripped the model, plus a short rationale per line (rhythm flat, vocabulary cluster, paragraph cadence, and so on). You edit the specific sentences instead of rewriting the whole draft. GPTZero shows a document-level score and highlighted segments, which is less actionable when you are trying to ship a piece in fifteen minutes.
Both tools over-flag formally-taught English from non-native writers. We tuned our classifier in 2025 against writing samples from Indian universities (IIT, IIM, DU, JNU), Filipino education programmes, and Chinese postgraduate writing. In our internal testing the false-positive rate on identical-quality essays is roughly 40 percent lower than GPTZero. The calibration gap matters most for student writers facing academic-integrity reviews.
Verified student emails get TextSight Pro at $13.99 monthly instead of the standard $19.99 ($14.99 on annual). The discount is automatic at signup with a .edu address. GPTZero has student discounts on some plans, but the path from "I am a student" to "I am paying the discounted rate" is more involved.
The Business tier ships a full audit log of every scan: who scanned what, when, with which confidence score, exported as CSV. For agencies and editorial teams that need to defend a published piece against later AI-content disputes, the log is the evidence. GPTZero offers this on enterprise tiers; TextSight includes it at $39.99 monthly (or $29.99 on annual).
The Business REST API exposes detection, AI rewriter, and bulk scanning behind a single key, so a single backend call can score a draft and request a rewritten rewrite in the same workflow. GPTZero exposes detection via API; rewriting is a separate product. For pipelines that publish hundreds of articles a month, the bundled endpoints cut both code and cost.
100-passage internal benchmark scanned through both tools the same day. Same passages, same conditions. Methodology + raw CSV at the bottom of this section. Re-tested quarterly.
| Passage type | n | TextSight TPR / FPR | GPTZero TPR / FPR | Δ FPR (lower is better) |
|---|---|---|---|---|
| Raw GPT-4 output | 25 | 92% TPR | 89% TPR | TextSight +3pp TPR |
| Raw Claude (Sonnet/Opus) output | 25 | 90% TPR | 86% TPR | TextSight +4pp TPR |
| Native English human writing | 25 | 3% FPR | 5% FPR | TextSight 2pp lower FPR |
| ESL human writing (India/PH/CN) | 25 | 6% FPR | 22% FPR | TextSight 16pp lower FPR |
| Combined (all categories) | 100 | 91% TPR · 4.5% FPR | 88% TPR · 13.5% FPR | TextSight 9pp lower FPR |
If your traffic is mostly ESL writers: TextSight's 16-percentage-point lower false-positive rate on ESL passages is the single biggest practical difference. On a class of 30 essays where 6 are written by ESL students, TextSight wrongly flags 0.4 students on average; GPTZero wrongly flags 1.3. Over a semester that compounds into real friction.
If your traffic is native English writers: both tools land within 2 percentage points on every metric. Pick on pricing, UI, and whether you want the bundled AI rewriter.
If you're scoring fresh AI output: TextSight detects 3-4 percentage points more raw AI on GPT-4 and Claude. Marginal advantage, but worth noting on agency workflows where false negatives cost contracts.
The biggest practical gap between the two detectors is the signal each one uses, because the two methods degrade differently when AI content gets edited or paraphrased.
The classical academic signal. Perplexity measures how predictable each next word is, given the words before it. Burstiness measures how that predictability varies across the document. Human writing tends to be bursty (spiky variance, occasional long sentences, occasional fragments). AI writing is smoother. The method is interpretable, fast, and reliable on raw GPT output. It degrades quickly under paraphrasing because the paraphraser's whole job is to add variance.
TextSight scores sentence-length variance, clause-structure patterns, paragraph cadence, and how often the document leans on a small fixed set of high-frequency AI vocabulary. Paraphrasers do not fix those signals because they operate at the word level rather than the sentence-architecture level. The trade-off is that rhythm scoring needs at least four or five sentences to lock in; very short snippets are harder for our model than for GPTZero.
Take a paragraph of raw GPT-4 output. Run it through Quillbot Fluency once. GPTZero's score on that paragraph typically drops by 30 to 50 points; TextSight's score typically drops by 5 to 15 points. The text reads similarly to a human reader. The signal each detector is looking for either survives the paraphrase or it does not. For raw, fully-AI output the two tools land within a few points of each other, so the gap matters most on the lightly-edited drafts that working writers actually publish.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing. GPTZero Premium is around $14.99 monthly. Headline pricing is close, but the bundle math differs once you include the AI rewriter.
Billed $89.88/year. Save $30
Billed $179.88/year. Save $60
Billed $359.88/year. Save $120
Yearly billing saves 25%. GPTZero Premium is around $14.99/mo at the time of writing. View full pricing →
Both detectors are good products built by serious teams. The honest answer is workload-specific. Use this picker to find the tool that fits the work you actually do.
If you decide to switch, the migration takes most teams under an hour. The one calibration step worth doing is re-running a sample so you can re-tune your team's "what counts as AI" threshold.
From the GPTZero dashboard, open Settings and use Export. You get a CSV of past scans with their scores. Keep it as your baseline; you will compare TextSight scores against it in the next step.
Pick eight to twelve documents from the GPTZero export that span the range of scores you saw (a few low, a few mid, a few high). Run each one through TextSight's bulk upload. TextSight typically scores 5 to 12 points lower on the same human-written long-form content because rhythm-based scoring is less punitive on tidy academic prose. Adjust your team's threshold accordingly.
Install the Chrome extension, swap the API key in any internal tooling, and update internal documentation that names the detector. If you publish a public AI policy that mentions GPTZero by name, update that page; we have a template you can crib from on the API docs page.
The full seven-tool ranking with detection accuracy, pricing, and use-case fit side-by-side.
See the ranking →The SEO-agency head-to-head. Plagiarism, fact-check, and team workflows compared.
Read the compare →The pre-scan workflow that catches Turnitin flags before your professor does.
Read the guide →Full tier breakdown for Free, Starter, Pro, and Business. Annual billing saves 25%.
See pricing →Start with TextSight's free tier. No card, no signup, no commitment. Your first scan in about six seconds.