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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 | copyleaks.com | Switch / compare |
|---|---|---|---|
| AI content detection | 96/100 JSON · Output attached | 94/100 JSON · Output attached | Active task |
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Browse this task →| Criterion | 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 | Copyleaks AI content detection 94/100 Seven-aspect task score Copyleaks accurately detected 100% AI generation probability with 0% plagiarism match on the 90-word pure LLM benchmark sample in 27.4 seconds. Beyond the headline score, it highlighted 15 distinct high-frequency AI phrases and delivered sentence-level diagnostic coloration, providing both precision and explainability. Tested export JSON · Output attached Historical test · 2026-11-01 |
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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 ↗ | Copyleaks Personal and Pro subscription pricing structure · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Personal (Monthly)2026-10-31 ↗ USD 16.99/month — Monthly 100 unified credits/mo (scan up to 25,000 words or 100 images), multi-file batch upload, extension, Google Docs add-on, MCP access AI text & image detection, 30+ languages AI detection, 100+ languages plagiarism check, Shared Data Hub Pro (Monthly)2026-10-31 ↗ USD 99.99/month — Monthly Includes 25 user seats, 1,000 unified credits/mo (up to 250,000 words or 1,000 images), website scanning, cross-language translation detection, analytics All Personal features, 25 seats, advanced filters, website scanning, cross-language translation detection, analytics dashboard Personal (Annual)2026-10-31 ↗ — USD 167.88/year Annual $167.88 billed annually ($13.99/mo equivalent), 1,200 unified credits (up to 300,000 words or 1,200 images) Personal tier annual features Pro (Annual)2026-10-31 ↗ — USD 899.88/year Annual $899.88 billed annually ($74.99/mo equivalent), 25 seats, 12,000 unified credits (up to 3M words or 12k images) Pro tier annual features 4 plan / billing-period records, all listed; — means that period is not recorded. Verified monthly rates: Personal $16.99/mo, Pro $99.99/mo; explicit annual upfront invoice totals: Personal $167.88/yr ($13.99/mo), Pro $899.88/yr ($74.99/mo); extra unified credits available for top-up. Cancellation, sources & verification recordCancellation and refund terms unverified Copyleaks Official Pricing Page (Annual View) ↗ · 2026-10-31 Capture 1 ↗ Copyleaks Official Pricing Page (Monthly View) ↗ · 2026-10-31 Capture 1 ↗ |
| Free & trial allowance on the test date | Not verified | Free trial credits granted upon signup for full scan execution |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Not verified | Input word count and remaining credits clearly visible prior to 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 | 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. | 100.0% AI probability detection with 15 granular AI phrases and full sentence-level diagnostic coloration. |
| Original historical observation | Not verified | Copyleaks processed the benchmark anchor in 27.38s server wait time, accurately flagging 100% AI probability and 15 phrase clusters (01_landing.png, 02_prompt_filled.png, 03_result.png). |
| Suitable uses · historical assessment | Not verified | Organizations and creators needing enterprise-grade AI originality verification, multilingual AIGC auditing, and academic integrity analysis |
| 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 | Semi-circular AI probability gauge + Resembles AI text percentage scale | Full sentence-level coloration + 15 AI phrase attributions + plagiarism comparison report |
| Watermark observation | Not verified | Zero watermark |
| Batch & API | Not verified | Supports single/batch text uploads, REST API, and MCP protocol integration |
| Recorded free-tier dimensions | Not verified | Not verified |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 7.68s · End-to-end reference: 7.68s | Network-observed server wait: 27.38s · End-to-end reference: 27.38s |
| Date & fixture | 2026-11-01 · 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 | No login in this test |
| Sign-in methods | Not verified | Demo on homepage; formal scan via Google account 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. | Copyleaks Inc. |
| Recorded origin | Not verified | Stamford, Connecticut, United States |
| Domain history record | Not verified | Founded in 2015 |
| Background & reputation assessment | Not verified | Not verified |
| External reputation record | Not verified | Top-tier content authenticity, copyright compliance, and AIGC detection platform listed on Inc. 5000. |
| Engineering & privacy | ||
| Processing location | Processing location unconfirmed | Uploaded for cloud processing |
| Third-party tracking record | Google Analytics · Datadog · Cloudflare | Google Analytics · Google Tag Manager |
| 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 | 18 / 20 Clean unwatermarked export (8/8); Export spec: Semi-circular AI probability gauge + Resembles AI text percentage scale | 20 / 20 Clean unwatermarked export (8/8); Export spec: Full sentence-level coloration + 15 AI phrase attributions + plagiarism comparison report |
| Processing speed | 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) | 10 / 15 Network-observed server wait: 27.38s (API mode: async_verified; network upload 0s / end-to-end 27.38s shown for reference only, never penalized) |
