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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 | grammarly.com | scribbr.com | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | 92/100 TXT · Output attached | 88/100 TXT · Output attached | Active task |
| AI content detection | 96/100 JSON · Output attached | 98/100 JSON · Output attached |
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Browse this task →| Criterion | Grammarly AI paraphrasing & rewriting 92/100 Seven-aspect task score Grammarly delivered an outstanding performance in the 82-word English academic rewriting benchmark, restructuring syntax in 1.5 seconds. It achieved 85.2% lexical diversity while retaining 100% of all 7 crucial facts (including the $1,250,000 figure, 84.2% ratio, and verification token) with zero login requirements, no truncation, and no watermarks. Tested export TXT · Output attached Historical test · 2026-11-05 | Scribbr Paragraph Rewriter & Paraphraser AI paraphrasing & rewriting 88/100 Seven-aspect task score Scribbr integrates QuillBot's neural paraphrasing engine for sign-up-free English rewriting, completing a 5-sentence restructuring in 4.8s. It achieved 71.6% lexical diversity with 100.0% fact retention (all 7 crucial figures, dates, and verification token) and up to 125 words per guest run with direct copy and export. Tested export TXT · Output attached Historical test · 2026-11-06 |
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| Pricing & rules | ||
| Pricing plans | 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 ↗ | 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 ↗ |
| Free & trial allowance on the test date | Up to 125 words per submission without sign-up | Guest users can freely paraphrase texts up to 125 words per submission |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Clicking Paraphrase immediately displays the rewritten comparison on the right | Output displayed immediately alongside input comparison upon clicking Paraphrase |
| Task quality | ||
| Measured fixture results | Fact retention: 100% · Lexical diversity: 85.2% · Semantic similarity: 61.1% · Readability score: 100/100 | Fact retention: 100% · Lexical diversity: 71.6% · Semantic similarity: 53.7% · Readability score: 100/100 |
| Fixture findings | High 85.2% lexical diversity with 100% retention of all 7 financial and factual entities, responding in 1.5 seconds. | Deep syntactic restructuring across 5 sentences with 71.6% lexical diversity and 100.0% fact retention (7/7 facts). |
| Original historical observation | Grammarly cloud rewrote 82-word text deeply in 1.5s, retaining all 7 facts with professional layout (02_result.png, 03_download.png). | Not verified |
| Suitable uses · historical assessment | Users needing rapid syntactic restructuring of academic and business texts while strictly preserving factual accuracy | Not verified |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | TXT · Output attached · No watermark in test | TXT · Output attached · No watermark in test |
| Historical specification note · not an official maximum | 96-word rewritten prose with instant Copy text (768 bytes · zero truncation) | 94-word high-quality paraphrased text via copy/export (750 bytes · zero truncation) |
| Watermark observation | No watermark | Zero watermarks |
| Batch & API | Single-passage interactive rewriting with one-click copy, document upload supported | Not verified |
| Recorded free-tier dimensions | 768 | 750 |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 1.5s · End-to-end reference: 1.6s | Network-observed server wait: 4.8s · End-to-end reference: 4.9s |
| Date & fixture | 2026-11-05 · anchor_paraphrase_v1 · US-West (California, AS16509) | 2026-11-06 · anchor_paraphrase_v1 · US-West (California, AS16509) |
| 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 | No login in this test | No login in this test |
| Sign-in methods | Direct use with zero login or sign-up | Direct guest use without signup or login |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Not verified |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Grammarly, Inc. | Scribbr B.V. (Learneo, Inc.) |
| Recorded origin | Not verified | Not verified |
| Domain history record | Not verified | Not verified |
| Background & reputation assessment | Not verified | Not verified |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Processing location unconfirmed |
| Third-party tracking record | No third-party services listed in this record; this is not proof that none exist. | No third-party services listed in this record; this is not proof that none exist. |
| 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 | 54.3 / 65 Fact Retention: 100% · Lexical Diversity: 85.2% · Semantic Similarity: 61.1% · Readability Score: 100/100 | 50.1 / 65 Fact Retention: 100% · Lexical Diversity: 71.6% · Semantic Similarity: 53.7% · Readability Score: 100/100 |
| Deliverable specifications | 20 / 20 Clean unwatermarked export (8/8); Export spec: 96-word rewritten prose with instant Copy text (768 bytes · zero truncation) | 20 / 20 Clean unwatermarked export (8/8); Export spec: 94-word high-quality paraphrased text via copy/export (750 bytes · zero truncation) |
| Processing speed | 15 / 15 Network-observed server wait: 1.5s (API mode: sync; network upload 0.1s / end-to-end 1.6s shown for reference only, never penalized) | 14 / 15 Network-observed server wait: 4.8s (API mode: sync; network upload 0.1s / end-to-end 4.9s shown for reference only, never penalized) |
