Grammarly
Industry-leading AI writing assistant, grammar and spell checker, sentence paraphraser, and AI content detector
Product node overview & trust baseline
Operator provenance, privacy baseline and site-wide pricing belong directly to the product node and are inherited across linked task edgesGrammarly (founded in 2009 by Max Lytvyn, Alex Shevchenko, and Dmytro Lider, headquartered in San Francisco, California) is the world's most widely adopted AI writing and proofreading companion. Harnessing deep natural language processing and generative AI, it offers real-time grammar and spell checking, conciseness suggestions, vocabulary enhancements, tone detection, full-sentence rewriting, and AI content detection. Operating a freemium model: the Free tier provides essential mistake correction and 100 monthly AI prompts across browsers and desktop apps; Grammarly Pro ($12/month) unlocks one-click sentence restructuring, advanced tone adaptations, unlimited tailored suggestions, plagiarism & AI detection, and 2,000 monthly AI prompts.
United States · Founded and operational since 2009
Provenance baseline: 19/20 · Global leader in grammar and writing enhancement trusted by over 40 million individuals and 50,000 organizations.
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.
Pricing transparency baseline: 34/35 · Cancellation:
Enterprise-grade privacy; user texts are never sold to third parties; certified under SOC 2 Type 2, ISO 27001, ISO 27017, and ISO 27018
Google Analytics · Datadog · Cloudflare
Product-level pricing & rules baseline
Verified plans, billing periods and cancellation terms owned by this product node; task-specific credit costs and free export limits are detailed per capability edge belowGrammarly Free and Pro subscription pricing structure · 2026-10-31
Basic grammar and spell check, tone detection
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 record
Cancellation and refund terms unverified
Grammarly Plans Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗
Archived official pricing sources: Grammarly Plans Official Pricing Page (2026-10-31) [text snapshot ↗]
Capability map & linked task edges
Whenever a capability passes fixed-fixture testing, an edge is automatically linked between this product node and the task topic for horizontal comparison.
| Linked task edge | Score | Assessment · historical test | Test scope & delivery | Inspect capability / follow edge |
|---|---|---|---|---|
| AI content detection | 96/100 | 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. | JSON · Output attached Historical test · 2026-11-01 Account / tier unconfirmed · Calibrated AI vs human text benchmark (literature master & LLM prose, 780 B) · Output attached |
Discovered product capabilities (pending fixture test / edge incubation)
Recorded capability · Not yet scoredThese capabilities have been identified on the product but have not yet undergone fixed-fixture testing. When an emerging capability co-occurs across multiple products, it incubates a new task edge.
Tested task edges (with scores and native artifacts) are strictly separated from discovered untested capabilities (unscored).
Peer product comparison across shared task edges
Matched by overlapping tested task edges; compare site-wide billing models alongside per-task benchmark scoresVerified 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.
- AI content detection：Grammarly 96/100 vs Copyleaks 94/100
Verified direct monthly rates: Premium $23.99/mo, Professional $45.99/mo; annual plan cards show monthly equivalents ($12.99/mo, $24.99/mo) without explicit annual invoice total; Free tier provides 10,000 words/mo.
- AI content detection：Grammarly 96/100 vs GPTZero 96/100
Linked capability test: AI content detection
2026-11-01 · Native output attached. Findings cover the recorded fixture and conditions; paid specifications may be untested.
Verified native export & same-run screenshot evidence
Open native exported file (JSON · Output attached) ↗
Task quality
AI probability 100% · Human probability 0% · Classification label AI-generated · Confidence calibrated Yes
Detailed facts & historical record
- Measured fixture results
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.
- Original historical observation
Not verified
- Suitable uses · historical assessment
Not verified
- Result & output evidence
Delivery capabilities
JSON · Output attached · Check watermark record
Detailed facts & historical record
- Recorded export specifications
JSON · Output attached · Check watermark record
- Historical specification note · not an official maximum
Semi-circular AI probability gauge + Resembles AI text percentage scale
- Watermark observation
Not verified
- Batch & API
Not verified
- Recorded free-tier dimensions
Not verified
- Attached file dimensions
Not verified
Speed & reliability
About 7.68s end to end in this run; reliability not retested
Detailed facts & historical record
- Timing observation
Network-observed server wait: 7.68s · End-to-end reference: 7.68s
- Date & fixture
2026-11-01 · anchor_aidetector_v1 · US-West (California, AS2914)
- Repeated tests & reliability
No standardized repetition count, success rate or variability range is recorded.
Interaction experience
Account requirement unconfirmed
Detailed facts & historical record
- Account requirements
Not verified
- Sign-in methods
Not verified
- Manual adjustment
Not verified
- Interaction observations
Not verified
Background & reputation
Grammarly, Inc. · Long-term reputation not independently verified
Detailed facts & historical record
- Service lifecycle notice
Not verified
- Operator
Grammarly, Inc.
- Recorded origin
Not verified
- Domain history record
Not verified
- Background & reputation assessment
Not verified
- External reputation record
Not verified
Engineering & privacy
Processing location unconfirmed；Explicit retention period unconfirmed; inspect policy record
Detailed facts & historical record
- Processing location
Processing location unconfirmed
- Third-party tracking record
Google Analytics · Datadog · Cloudflare
- Engineering & privacy assessment
Not verified
- Retention statement
Explicit retention period unconfirmed; inspect policy record
Task free allowance & pricing disclosure
Not recorded
Not recorded
Site-wide plans belong to the product node (see Product-level pricing baseline ↑).
Expand site-wide plans aligned for AI content detection (2 records)
Grammarly Free and Pro subscription pricing structure · 2026-10-31
Basic grammar and spell check, tone detection
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 record
Cancellation and refund terms unverified
Grammarly Plans Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗
Evaluation basis & full scores · Overall 95.7/100
Overall = honesty & reputation × 30% + capability × 70%. Component maxima follow this report’s rubric. List scores are rounded for display; original precision is retained here.
Scoring version 2.3.1 · Test fixture anchor_aidetector_v1
Honesty & reputation · 95/100 · 30%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| Pricing transparency | 34 / 35 | Explanation unavailable | Evidence A → |
| Interaction restraint | 28 / 30 | Explanation unavailable | Evidence A → |
| Background & reputation | 19 / 20 | Explanation unavailable | Evidence A → |
| Engineering & privacy | 14 / 15 | Explanation unavailable | Evidence A → |
Capability · 96/100 · 70%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| Task quality | 65 / 65 | AI Probability: 100% · Human Probability: 0% · Label: ai · Calibrated: Yes | Evidence A → |
| Deliverable specifications | 18 / 20 | Clean unwatermarked export (8/8); Export spec: Semi-circular AI probability gauge + Resembles AI text percentage scale | Evidence A → |
| 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) | Evidence A → |
Legacy scores may include advertised maximum capabilities. Read tested output separately from paid capabilities. Records without matching tiers and scope are not ranked together.
Developer & citation kit · Claim updates, request benchmarks & embed verified badges
Product developers and writers can embed these SVG badges in official websites, GitHub READMEs or documentation, or use the channels below to sync product-wide plans and capabilities.
[](https://realtest.org/tools/grammarly.com/) <a href="https://realtest.org/tools/grammarly.com/"><img src="https://realtest.org/badges/grammarly.com.svg" alt="Grammarly — RealTest" height="24" /></a> 
[](https://realtest.org/tools/grammarly.com/#feature-ai-detector)