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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 | stealthwriter.ai | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | 92/100 TXT · Output attached | 87/100 TXT · Output attached | Active task |
| AI content detection | 96/100 JSON · Output attached | 96/100 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 | StealthWriter AI paraphrasing & rewriting 87/100 Seven-aspect task score StealthWriter AI Humanizer (Ghost 5.2 Mini) excelled on the 80-word benchmark, delivering 80.7% lexical diversity at Level 8 while preserving 100% of all 7 key facts, amounts, and verification token without hallucination. Cloud inference completed in 4.03s with comparison and one-click copy. Tested export TXT · Output attached Historical test · 2026-11-04 |
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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 ↗ | StealthWriter Free, Starter, Plus, Pro, Business, and Scale subscription pricing plans · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ Free Free Free 10 humanizations/day, 10 AI scans/day, 1,000 words per input, Ghost 5.2 Mini included Basic AI detection and humanization Starter (Monthly)2026-10-31 ↗ USD 20/month — Monthly 50 humanizations/day, 50 AI scans/day, 5,000 words per input, Ghost 5.2 Pro and Legacy included Ghost 5.2 Pro advanced humanization and deep AI scan Starter (Annual)2026-10-31 ↗ — USD 200/year Annual Billed annually at $200.00 ($16.67/mo equivalent), 50 humanizations/day, 50 AI scans/day Ghost 5.2 Pro advanced humanization and deep AI scan Plus (Monthly)2026-10-31 ↗ USD 50/month — Monthly 150 humanizations/day, 150 AI scans/day, 5,000 words per input, fastest response, priority support Full high-frequency AI detection and humanization Plus (Annual)2026-10-31 ↗ — USD 500/year Annual Billed annually at $500.00 ($41.67/mo equivalent), 150 humanizations/day, 150 AI scans/day Full high-frequency AI detection and humanization Pro (Monthly)2026-10-31 ↗ USD 100/month — Monthly 350 humanizations/day, 350 AI scans/day, 5,000 words per input, heavy daily usage High volume professional AI detection and humanization Pro (Annual)2026-10-31 ↗ — USD 1,000/year Annual Billed annually at $1000.00 ($83.33/mo equivalent), 350 humanizations/day, 350 AI scans/day High volume professional AI detection and humanization 7 plan / billing-period records, all listed; — means that period is not recorded. Verified monthly rates: Starter $20/mo, Plus $50/mo, Pro $100/mo; annual plans explicitly show invoice totals: Starter $200/yr ($16.67/mo equiv), Plus $500/yr, Pro $1000/yr; Free tier provides 10 humanizations/day and 10 AI scans/day. Cancellation, sources & verification recordCancellation and refund terms unverified StealthWriter Official Pricing Page (Monthly) ↗ · 2026-10-31 Capture 1 ↗ StealthWriter Official Pricing Page (Annual) ↗ · 2026-10-31 Capture 1 ↗ |
| Free & trial allowance on the test date | Up to 125 words per submission without sign-up | Free accounts reset daily quota at specified time |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Clicking Paraphrase immediately displays the rewritten comparison on the right | Interface explicitly displays daily reset timer and 1,000-word limit |
| 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: 80.7% · Semantic similarity: 56.8% · 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. | Fact retention rate 100% (7/7), lexical diversity 80.7%, readability score 100, cloud response 4.03s, capability score reached 85.5. |
| 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) | 105-word structured rewritten text (786 bytes) |
| Watermark observation | No watermark | No watermark |
| Batch & API | Single-passage interactive rewriting with one-click copy, document upload supported | Not verified |
| Recorded free-tier dimensions | 768 | Not verified |
| 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: 4.03s · End-to-end reference: 4.3s |
| Date & fixture | 2026-11-05 · anchor_paraphrase_v1 · US-West (California, AS16509) | 2026-11-04 · 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 | Account required in this test |
| Sign-in methods | Direct use with zero login or sign-up | Google OAuth or email login required; free tier offers 10 runs/day (up to 1,000 words/run) |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Not verified |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Grammarly, Inc. | AiVantage LLC |
| 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. | 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 | 54.3 / 65 Fact Retention: 100% · Lexical Diversity: 85.2% · Semantic Similarity: 61.1% · Readability Score: 100/100 | 52.5 / 65 Fact Retention: 100% · Lexical Diversity: 80.7% · Semantic Similarity: 56.8% · 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: 105-word structured rewritten text (786 bytes) |
| 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) | 13 / 15 Network-observed server wait: 4.03s (API mode: sync_json_verified; network upload 0s / end-to-end 4.3s shown for reference only, never penalized) |
