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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 | prowritingaid.com | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | 88/100 TXT · Output attached | 86/100 JSON · Output attached | Active task |
| AI content detection | 98/100 JSON · Output attached | Not tested in topic | Compare in task topic → |
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Browse this task →| Criterion | 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 | ProWritingAid AI paraphrasing & rewriting 86/100 Seven-aspect task score ProWritingAid, a renowned writing companion in professional publishing and fiction writing, delivers robust sentence restructuring and flawless factual fidelity via its Rephrase feature. Against our 80-word benchmark sample, the cloud API responded in 1.45 seconds with 3 candidate rewrites across 8 nuanced tones, preserving 100% of critical numbers ($1,250,000) and verification token REALTEST-PARAPHRASE-VERIFIED-2026. Offering an anonymous daily quota of 10 rephrases without intrusive ads, it demonstrates commendable engineering discipline. Tested export JSON · Output attached Historical test · 2026-11-03 |
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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 ↗ | ProWritingAid Free, Premium, and Premium Pro recurring subscriptions and lifetime plans · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ Free Free Free 10 rephrases/day, 2 report runs/day (up to 500 words), basic grammar and spelling check Basic style analysis and grammar rephrasing Premium (Monthly)2026-10-31 ↗ USD 30/month — Monthly Unlimited rephrases, unlimited 25+ manuscript reports, 1 chapter critique/day, custom style guide Professional fiction style analysis and manuscript editing Premium (Annual)2026-10-31 ↗ — USD 120/year Annual Billed annually at $120.00 ($10.00/mo equivalent), unlimited rephrases and manuscript reports Professional fiction style analysis and manuscript editing Premium (Lifetime)2026-10-31 ↗ USD 399 · one-time payment Usage / one-time Usage / one-time One-time lifetime payment of $399.00 for permanent access to all Premium features Lifetime unlimited style analysis and editing Premium Pro (Monthly)2026-10-31 ↗ USD 36/month — Monthly All Premium features plus 30 chapter critiques/day, author community access, and live workshops Advanced fiction critique and master workshops Premium Pro (Annual)2026-10-31 ↗ — USD 144/year Annual Billed annually at $144.00 ($12.00/mo equivalent), 30 chapter critiques/day, community access Advanced fiction critique and master workshops Premium Pro (Lifetime)2026-10-31 ↗ USD 699 · one-time payment Usage / one-time Usage / one-time One-time lifetime payment of $699.00 for permanent access to all Premium Pro features Lifetime advanced critique and community access 7 plan / billing-period records, all listed; — means that period is not recorded. Verified pricing tabs clearly specify monthly rates ($30/mo, $36/mo), exact upfront annual totals ($120/yr at $10/mo equiv, $144/yr at $12/mo equiv), and lifetime single charges ($399, $699); Free tier includes 10 rephrases/day and 2 report runs/day. Cancellation, sources & verification recordCancellation and refund terms unverified ProWritingAid Official Pricing Cards (Annual) ↗ · 2026-10-31 Capture 1 ↗ ProWritingAid Official Pricing Cards (Monthly) ↗ · 2026-10-31 Capture 1 ↗ ProWritingAid Official Pricing Cards (Lifetime) ↗ · 2026-10-31 Capture 1 ↗ |
| Free & trial allowance on the test date | Guest users can freely paraphrase texts up to 125 words per submission | Not verified |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Output displayed immediately alongside input comparison upon clicking Paraphrase | Not verified |
| Task quality | ||
| Measured fixture results | Fact retention: 100% · Lexical diversity: 71.6% · Semantic similarity: 53.7% · Readability score: 100/100 | Fact retention: 100% · Lexical diversity: 12.5% · Semantic similarity: 92.9% · Readability score: 100/100 |
| Fixture findings | Deep syntactic restructuring across 5 sentences with 71.6% lexical diversity and 100.0% fact retention (7/7 facts). | Solid benchmark performance: 100% fact and verification token retention, 92.9% semantic similarity, 8 tone options, and rapid 1.45s turnaround. |
| Original historical observation | Not verified | Not verified |
| Suitable uses · historical assessment | Not verified | Not verified |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | TXT · Output attached · No watermark in test | JSON · Output attached · Check watermark record |
| Historical specification note · not an official maximum | 94-word high-quality paraphrased text via copy/export (750 bytes · zero truncation) | Sentence-level 3 rephrase candidates + 8 tone mode options |
| Watermark observation | Zero watermarks | Not verified |
| Batch & API | Not verified | Not verified |
| Recorded free-tier dimensions | 750 | Not verified |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 4.8s · End-to-end reference: 4.9s | Network-observed server wait: 1.45s · End-to-end reference: 1.45s |
| Date & fixture | 2026-11-06 · anchor_paraphrase_v1 · US-West (California, AS16509) | 2026-11-03 · anchor_paraphrase_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 | No login in this test | Not verified |
| Sign-in methods | Direct guest use without signup or login | 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.) | Orpheus Technology Ltd |
| 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 | Processing location unconfirmed | Processing location unconfirmed |
| Third-party tracking record | No third-party services listed in this record; this is not proof that none exist. | Stripe · Google Analytics · Datadog |
| 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 | 50.1 / 65 Fact Retention: 100% · Lexical Diversity: 71.6% · Semantic Similarity: 53.7% · Readability Score: 100/100 | 46.1 / 65 Fact Retention: 100% · Lexical Diversity: 12.5% · Semantic Similarity: 92.9% · Readability Score: 100/100 |
| Deliverable specifications | 20 / 20 Clean unwatermarked export (8/8); Export spec: 94-word high-quality paraphrased text via copy/export (750 bytes · zero truncation) | 20 / 20 Clean unwatermarked export (8/8); Export spec: Sentence-level 3 rephrase candidates + 8 tone mode options |
| Processing speed | 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) | 15 / 15 Network-observed server wait: 1.45s (API mode: sync_json_verified; network upload 0s / end-to-end 1.45s shown for reference only, never penalized) |
