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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 | grammarly.com | Switch / compare |
|---|---|---|---|
| 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 | 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 | 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 ↗ | 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 | Exceptional benchmark performance: 100.0% AI probability detection matching ground truth, complete with sentence attribution and style trigger analysis in just 1.03s. | 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 | 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 · Check watermark record |
| Historical specification note · not an official maximum | Overall AI probability verdict + sentence attribution and trigger analysis (Technical language, Overly polished) | 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: 1.03s · End-to-end reference: 1.03s | 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 | Not verified | Not verified |
| 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) | Grammarly, 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 | Processing location unconfirmed | Processing location unconfirmed |
| Third-party tracking record | Google Analytics · Datadog · Cloudflare | 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 | 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: Semi-circular AI probability gauge + Resembles AI text percentage scale |
| 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) | 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) |
