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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 | quillbot.com | stealthwriter.ai | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | Not tested in topic | 87/100 TXT · Output attached | Compare in task topic → |
| AI content detection | 97/100 JSON · Output attached | 96/100 JSON · Output attached | Active task |
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Browse this task →| Criterion | QuillBot AI content detection 97/100 Seven-aspect task score QuillBot, widely adopted by tens of millions of writers globally, demonstrates outstanding diagnostic precision and rapid turnaround with its AI Content Detector. Against our 90-word benchmark AI sample, the v7.1.0 cloud engine completed inference in 1.03s, delivering a calibrated 100.0% AI score alongside sentence-level highlighting and stylistic attribution. With full guest readability on results and registration only needed for PDF downloads, it represents a top-tier detection utility. Tested export JSON · Output attached Historical test · 2026-11-03 | StealthWriter AI content detection 96/100 Seven-aspect task score StealthWriter AI Detector (V2) performed exceptionally on the 90-word AIGC benchmark, completing cloud inference in just 0.79 seconds with an accurate 100% AI / 0% Human verdict alongside sentence-level Deep Scan highlights. Transparent corporate identity and pricing with guest demo access up to 500 words. Tested export JSON · Output attached Historical test · 2026-11-04 |
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| Pricing & rules | ||
| Pricing plans | QuillBot Free and Premium annual pricing structure · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ USD 0/month — Monthly Paraphrase up to 100 words in 2 modes, basic grammar fixes and limited AI detection Text rewriting, basic grammar proofreading, summarizer, citation generator Premium (Annual)2026-10-31 ↗ — Annual price not verified Annual Unlimited words paraphrased, all 9 modes, full AI Humanizer, 25k words/mo plagiarism checks, full AI Detector Unlimited words, advanced suggestions, tone analysis, faster processing；Displays only equivalent $8.33 USD/mo billed annually without explicit annual total 2 plan / billing-period records, all listed; — means that period is not recorded. Annual tier displays $8.33 USD per month billed annually (58% off) without explicit annual invoice total; annual amount remains null and unverified. Free tier is permanently free with 100-word limit. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancellation and refund terms unverified QuillBot Premium 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 | Not verified | Free demo allowance provided daily, up to 500 words per scan |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Not verified | Explicitly discloses 500-word limit and daily limits before scanning |
| 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 | Exceptional benchmark performance: 100.0% AI probability detection matching ground truth, complete with sentence attribution and style trigger analysis in just 1.03s. | Benchmark sample diagnosis accuracy reached 100.0%, perfectly matching ground-truth expectation with 0.79s server response and 98.0 capability score. |
| Original historical observation | Not verified | 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 · No watermark in test |
| Historical specification note · not an official maximum | Overall AI probability verdict + sentence attribution and trigger analysis (Technical language, Overly polished) | Direct 0% Human / 100% AI verdict + Deep Scan sentence highlights |
| Watermark observation | Not verified | No watermark |
| 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: 1.03s · End-to-end reference: 1.03s | Network-observed server wait: 0.79s · End-to-end reference: 1.06s |
| Date & fixture | 2026-11-03 · anchor_aidetector_v1 · US-West (California, AS2914) | 2026-11-04 · 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 | No login in this test |
| Sign-in methods | Not verified | Direct guest demo up to 500 words per scan; full version supports Google OAuth or email sign-in |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Not verified |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Learneo, Inc. (Quillbot Division) | 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 | Processing location unconfirmed | Processing location unconfirmed |
| Third-party tracking record | Google Analytics · Datadog · Cloudflare | 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 | 20 / 20 Clean unwatermarked export (8/8); Export spec: Overall AI probability verdict + sentence attribution and trigger analysis (Technical language, Overly polished) | 18 / 20 Clean unwatermarked export (8/8); Export spec: Direct 0% Human / 100% AI verdict + Deep Scan sentence highlights |
| Processing speed | 15 / 15 Network-observed server wait: 1.03s (API mode: sync_json_verified; network upload 0s / end-to-end 1.03s shown for reference only, never penalized) | 15 / 15 Network-observed server wait: 0.79s (API mode: sync_json_verified; network upload 0s / end-to-end 1.06s shown for reference only, never penalized) |
