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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 | grammarly.com | 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 | Grammarly AI content detection 96/100 Seven-aspect task score Grammarly's AI Detector brings the company's trademark engineering polish and friction-free user experience to content authenticity verification. Allowing guest users to scan up to 1,400 words without registration, the cloud pipeline completed evaluation in 7.68s, delivering a calibrated 100.0% AI detection verdict with an elegant semi-circular gauge and zero ad distractions. 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 ↗ | Grammarly Free and Pro subscription pricing structure · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ USD 0/month — Monthly Basic spelling and grammar correction, tone detection, 100 AI prompts/month Basic grammar and spell check, tone detection Pro2026-10-31 ↗ USD 12/month — Monthly One-click sentence rewriting, tone adjustments, unlimited personalized suggestions, plagiarism & AI detection, 2,000 AI prompts/mo Full sentence rewriting, tone adjustments, plagiarism check, AI content detection 2 plan / billing-period records, all listed; — means that period is not recorded. Free tier is permanently free; Pro tier is $12/month with a 7-day free trial and email reminder sent 2 days prior to billing. Cancellation, sources & verification recordCancellation and refund terms unverified Grammarly Plans 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 accurately matching ground truth, supporting up to 1,400 words per guest submission, with a 7.68s response time. |
| 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 | Semi-circular AI probability gauge + Resembles AI text percentage scale |
| 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: 7.68s · End-to-end reference: 7.68s |
| 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.) | Grammarly, 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 | Google Analytics · Datadog · 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: Semi-circular AI probability gauge + Resembles AI text percentage scale | |
| 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) | 13 / 15 Network-observed server wait: 7.68s (API mode: async_verified; network upload 0s / end-to-end 7.68s shown for reference only, never penalized) |
