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GPTZero
Classroom-first AI detection with writing-replay proof — strong on explainability, contentious on billing.
$288/yr (≈$24/mo, billed annually)
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Originality.AI
Credit-based AI detection and originality suite for publishers and editorial teams
$12.95/mo
Try Originality.AI Full review →Our pick
GPTZero
Best for Educators and institutions checking student work who need sentence-level evidence, Writing Replay drafting proof, LMS integrations, and FERPA/GDPR compliance — and can live with annual pricing billed upfront and a geo-rendered checkout.
For a content team or publisher that needs plagiarism next to detection, Originality.AI at $12.95/mo (annual) is the pick — it's the only one of the two built for editorial workflows, and it answers its negative reviews. For teachers and occasional checkers, GPTZero's free tier (10,000 words/month) covers the need without touching its billing system, which is where its documented problems live. Choose GPTZero paid only if the explainability layer and institutional integrations are mission-critical for a school.
Feature comparison
| Feature | GPTZero | Originality.AI | Winner |
|---|---|---|---|
| Starting price (verified Oct 2026) | Free tier; Premium ≈$24/mo annual equivalent (educator-page value) | Free 100 one-time credits; Pro $12.95/mo annual | — |
| Free tier | 10,000 words/mo, Basic Scan + 1 Advanced Scan | 100 one-time credits (~10K words), all features, no subscription | — |
| Plagiarism checking | Advanced plagiarism on higher tiers | Included — combined AI + plagiarism scan (2 credits/100 words) | — |
| Explainability | Sentence-level color-coded highlighting + Writing Replay video of the drafting process | Deep Scan explains which sentences look AI and suggests ethical edits | — |
| Credit/quota mechanics | Monthly word allowance per tier | 1 credit = 100 words; subscription credits expire monthly; re-scans charge full credits | — |
| Team features | Team plan USD pending re-verify (geo-rendered at capture), 2-seat minimum, card only | Extra seats $8.62–$19.04/mo each; team management on Pro | — |
| Compliance & integrations | SOC 2 Type II, FERPA/GDPR/CCPA, Google Classroom, Canvas, Zapier, API | Chrome extension, Google Docs scanning, API on Enterprise | — |
| Documented review record | Trustpilot 2.1/5 (43 reviews last 12 mo) — billing complaints and ESL false positives; vendor does not reply | Replies to 100% of negative Trustpilot reviews (typically <24h); Oct 2026 5.0 model update drew accuracy complaints | — |
Side-by-side deep dive
What it does best
- Sentence-level, color-coded highlighting shows why text is flagged instead of returning a bare percentage — the point G2 reviewers praise most.
- Writing Replay records the drafting process on video, including pastes and typing patterns — evidence most detectors in this category don't offer.
- Free tier covers 10,000 words/month with Basic Scan plus 1 Advanced Scan, enough to evaluate before paying.
- Institution-grade plumbing: Google Classroom, Canvas, Zapier, an API with code in 17 languages, SOC 2 Type II, and FERPA/GDPR/CCPA compliance.
The catch
- Trustpilot sits at 2.1/5 (43 reviews in the last 12 months), led by billing complaints — including a €101.54 annual charge on day one of a free trial — and the company hasn't replied to negative reviews.
- False positives on human writing are the top detection complaint: reviewers report ESL academic writing and pre-AI-era books flagged as 100% AI.
- Cancellation is described as a multi-screen flow routed through Stripe, with one reviewer reporting charges continuing after email-confirmed cancellation.
What it does best
- Full originality stack — AI detection, plagiarism, readability, grammar, and fact/hallucination checks — funded from one credit balance
- Deep Scan explains which sentences look AI-generated and suggests ethical edits
- Writing Replay in the Chrome extension evidences authorship while scanning in Google Docs
- Replies to 100% of negative Trustpilot reviews, typically within 24 hours
The catch
- Subscription credits expire monthly — unused Pro credits vanish at renewal
- Re-scans charge full credits even after minor edits
- October 2026 5.0 model update drew accuracy complaints and removed legacy models without refunds
Pricing showdown
| Plan | GPTZero | Originality.AI |
|---|---|---|
| Free plan | Yes | Yes |
| Pricing type | freemium | freemium |
| Starting price | $288/yr (≈$24/mo, billed annually) | $12.95/mo |
| Enterprise | Custom | Custom |
Use-case matching
Choose GPTZero if...
- Educators and institutions checking student work who need sentence-level evidence
- Writing Replay drafting proof
- LMS integrations
- and FERPA/GDPR compliance — and can live with annual pricing billed upfront and a geo-rendered checkout.
Choose Originality.AI if...
- Content teams
- agencies
- and affiliate publishers who screen every submission for AI content AND plagiarism in one pass
- want per-sentence Deep Scan explanations
- and prefer a vendor that replies to negative reviews within a day.
Final verdict
Our pick: GPTZero
For a content team or publisher that needs plagiarism next to detection, Originality.AI at $12.95/mo (annual) is the pick — it's the only one of the two built for editorial workflows, and it answers its negative reviews. For teachers and occasional checkers, GPTZero's free tier (10,000 words/month) covers the need without touching its billing system, which is where its documented problems live. Choose GPTZero paid only if the explainability layer and institutional integrations are mission-critical for a school.
Full comparison
Method
Researched from both vendors' own pricing pages, FAQs, and review profiles, verified 2026-10-26. We have not deployed either detector on a production workflow — accuracy statements below are labeled vendor claims or documented user reports, nothing more.
Quick verdict
For a publisher screening freelance submissions, Originality.AI wins: $12.95/mo annual buys detection and plagiarism on one credit balance, Deep Scan names the exact sentences that look AI, and the vendor answers every negative review — a risk profile its rival doesn't match. For a teacher grading essays, GPTZero's free tier is the better tool and the safer wallet: 10,000 words a month, sentence-level evidence you can show students, and no billing relationship unless you choose one.
The catch on each side
GPTZero's catch is commercial, not technical. The explainability layer is the best in the category, and Writing Replay — a video record of how a document was drafted, pastes included — is genuinely unique evidence. But Trustpilot sits at 2.1/5 across 43 reviews in the last year, led by billing complaints (a €101.54 annual charge on day one of a free trial) and by false positives on ESL academic writing. USD list pricing wasn't verifiable at review — the pricing page geo-renders regional pricing, and annual plans bill upfront.
Originality.AI's catch is structural. Subscription credits expire monthly whether you scan or not; re-scans after minor edits charge full credits; extra seats cost $8.62–$19.04/mo each, so light users subsidize capacity they never use. The October 2026 5.0 model update removed legacy models without refunds and drew accuracy complaints — worth knowing before you build a workflow on any single model version.
When to use both
They're cheap enough to pair for high-stakes screening: GPTZero's free tier as the first-pass explainability layer, Originality.AI's paid credits where plagiarism matters as much as detection. The overlap costs nothing extra — a combined Originality scan runs 2 credits per 100 words, and GPTZero's 10,000 free words cover the explainability pass.
The one-liner
GPTZero is evidence-first for classrooms; Originality.AI is workflow-first for publishers — and the billing pages predict your experience better than the accuracy pages.
Full breakdowns: GPTZero · Originality.AI · also compare Winston AI vs Originality.AI. Where the wider stack fits together: AI SEO tools guide.
Commission note: both tools run affiliate programs; figures above are from vendor pricing pages verified 2026-10-26, not affiliate materials. We also recommend tools with no affiliate program when they're the best fit.
Frequently asked questions
Which is more accurate, GPTZero or Originality.AI?
Is Originality.AI cheaper than GPTZero?
Do both tools check for plagiarism?
Which one should a teacher use?
Can I cancel either subscription easily?
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