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Test scope & comparison notes
These are recorded facts, not a unified ranking. Tested tiers and scope are not consistently recorded. Read pricing with its date and timing with its conditions. Privacy observations reflect visible flows and statements, not a security audit.
Cross-task capability coverage across selected products
Each product is scored independently per task edge; switch tasks below while keeping shared products selected| Task edge | scribbr.com | gptzero.me | Switch / compare |
|---|---|---|---|
| AI content detection | 98/100 JSON · Output attached | 96/100 JSON · Output attached | Active task |
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Browse this task →| Criterion | Scribbr AI content detection 98/100 Seven-aspect task score Scribbr Free AI Detector, powered by Learneo/QuillBot v7.1.0, evaluated our 90-word benchmark sample in 1.8s (2.0s end-to-end), accurately detecting 100.0% AI probability with sentence-level diagnostic coloration and guest access up to 1,200 words, earning an overall score of 98. Tested export JSON · Output attached Historical test · 2026-11-03 | GPTZero AI content detection 96/100 Seven-aspect task score GPTZero, a prominent leader in academic and enterprise AI detection, delivered exceptional diagnostic precision and engineering polish. Against our benchmark AI sample, the cloud-based Model 3.3b completed evaluation in 2.50s, accurately assigning a 100.0% AI probability with zero false-negative drift. With sentence-level coloration, perplexity metrics, and a clean guest workflow, GPTZero firmly earns its top-tier benchmark standing. Tested export JSON · Output attached Historical test · 2026-11-01 |
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| Pricing & rules | ||
| Pricing plans | Scribbr free sign-up-free tools and pay-per-check plagiarism report pricing model · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free Tools2026-10-31 ↗ Free Free Free Unlimited free AI detection without sign-up (up to 1,200 words/check), basic plagiarism match overview, citation generator Basic AI content detection and citation generation Small Document (Per Check)2026-10-31 ↗ USD 19.95 · one-time payment Usage / one-time Usage / one-time Full plagiarism report for up to 7,499 words, Turnitin database comparison, self-plagiarism check, AI highlights Turnitin plagiarism check and AI content analysis Regular Document (Per Check)2026-10-31 ↗ USD 29.95 · one-time payment Usage / one-time Usage / one-time Full plagiarism report for 7,500 to 49,999 words (dissertations/theses/journal submissions) Academic plagiarism check for regular manuscripts and theses Large Document (Per Check)2026-10-31 ↗ USD 39.95 · one-time payment Usage / one-time Usage / one-time Full plagiarism report for 50,000+ words large dissertations and manuscripts Academic plagiarism check for extensive monographs and dissertations 4 plan / billing-period records, all listed; — means that period is not recorded. AI detector and citation tools are 100% free with no sign-up; premium plagiarism check is billed per document without recurring subscription: Small $19.95, Regular $29.95, Large $39.95. Cancellation, sources & verification recordCancellation and refund terms unverified Scribbr Plagiarism Checker & Pricing Page ↗ · 2026-10-31 Capture 1 ↗ | GPTZero Free, Premium, and Professional subscription pricing structure · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ USD 0/month — Monthly 10,000 words per month, basic AI scan, 1 free advanced scan, 5 AI highlights in Chrome extension Basic AI scan and detection Premium (Monthly)2026-10-31 ↗ USD 23.99/month — Monthly 300,000 words per month, advanced AI scan, multilingual detection, downloadable AI reports Advanced multi-model detection, exportable reports, extension highlights Professional (Monthly)2026-10-31 ↗ USD 45.99/month — Monthly 500,000 words per month (up to 2M overage), batch scan up to 250 files at once, page-by-page scanning All of Premium, batch scanning up to 250 files, page-by-page scanning, enterprise security Premium (Annual)2026-10-31 ↗ — Annual price not verified Annual 300,000 words per month, advanced AI scan Advanced AI scan and downloadable reports；Displays only equivalent $12.99/mo billed annually without explicit annual total Professional (Annual)2026-10-31 ↗ — Annual price not verified Annual 500,000 words per month, 250 files batch scan Full batch and page-by-page scan；Displays only equivalent $24.99/mo billed annually without explicit annual total 5 plan / billing-period records, all listed; — means that period is not recorded. Verified direct monthly rates: Premium $23.99/mo, Professional $45.99/mo; annual plan cards show monthly equivalents ($12.99/mo, $24.99/mo) without explicit annual invoice total; Free tier provides 10,000 words/mo. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancellation and refund terms unverified GPTZero Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗ |
| Free & trial allowance on the test date | Not verified | Not verified |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Not verified | Not verified |
| Task quality | ||
| Measured fixture results | AI probability: 100% · Human probability: 0% · Classification label: AI-generated · Confidence calibrated: Yes | AI probability: 100% · Human probability: 0% · Classification label: AI-generated · Confidence calibrated: Yes |
| Fixture findings | Accurately diagnosed 100.0% AI probability and 0% human probability matching ground truth, providing full sentence-level coloration breakdown. | Flawless benchmark performance: 100.0% AI probability detection aligning completely with ground truth, calibrated confidence, and a rapid 2.50s turnaround. |
| Original historical observation | Submitted 90-word standard AI anchor text (anchor_aidetector_v1, ai_sample.txt) to Scribbr AI detector (scribbr.com/ai-detector/); evaluated via v7.1.0 model in 1.8s (2.0s end-to-end), accurately diagnosing 100% AI generation probability with complete sentence-level diagnostic coloration (01_landing.png, 02_result.png). | Not verified |
| Suitable uses · historical assessment | Not verified | Not verified |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | JSON · Output attached · Check watermark record | JSON · Output attached · Check watermark record |
| Historical specification note · not an official maximum | Not verified | Overall AI/Mixed/Human probability verdict + AI Sentences/Patterns/Vocab dimensional analysis |
| Watermark observation | Not verified | Not verified |
| Batch & API | Not verified | Not verified |
| Recorded free-tier dimensions | Not verified | Not verified |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 1.8s · End-to-end reference: 2s | Network-observed server wait: 2.5s · End-to-end reference: 2.5s |
| Date & fixture | 2026-11-03 · anchor_aidetector_v1 · US-West (California, AS2914) | 2026-11-01 · anchor_aidetector_v1 · US-West (California, AS2914) |
| Repeated tests & reliability | No standardized repetition count, success rate or variability range is recorded. | No standardized repetition count, success rate or variability range is recorded. |
| Interaction experience | ||
| Account requirements | Not verified | Not verified |
| Sign-in methods | No login required for basic tools; Google OAuth or email for premium plagiarism checks | Not verified |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Not verified |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Scribbr B.V. (Learneo, Inc.) | GPTZero Inc. |
| Recorded origin | Amsterdam, Netherlands / California, US | Not verified |
| Domain history record | Founded in 2012 | Not verified |
| Background & reputation assessment | Not verified | Not verified |
| External reputation record | Internationally recognized academic integrity brand serving millions of students, backed by top Trustpilot rating. | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Processing location unconfirmed |
| Third-party tracking record | Google Analytics · Datadog | Stripe · Google Analytics · Cloudflare |
| Engineering & privacy assessment | Not verified | Not verified |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Explicit retention period unconfirmed; inspect policy record |
| Evaluation basis | ||
| Pricing transparency | ||
| Interaction restraint | ||
| Background & reputation | ||
| Engineering & privacy | ||
| Task quality | 65 / 65 AI Probability: 100% · Human Probability: 0% · Label: ai · Calibrated: Yes | 65 / 65 AI Probability: 100% · Human Probability: 0% · Label: ai · Calibrated: Yes |
| Deliverable specifications | 18 / 20 Clean unwatermarked export (8/8); Export spec: Overall AI/Mixed/Human probability verdict + AI Sentences/Patterns/Vocab dimensional analysis | |
| Processing speed | 15 / 15 Network-observed server wait: 1.8s (API mode: cloud_api_sync; network upload 0.2s / end-to-end 2s shown for reference only, never penalized) | 15 / 15 Network-observed server wait: 2.5s (API mode: async_verified; network upload 0s / end-to-end 2.5s shown for reference only, never penalized) |
