Grammarly
by Grammarly · AI writing assistant for grammar, tone and rewriting across apps
BenchRank score
Screenshots of Grammarly
Homepage
Overview
Grammarly is an AI writing assistant that checks spelling, grammar and tone, rewrites sentences and paragraphs, and generates text from prompts. It runs inside other apps and websites via desktop apps, browser extensions, MS Office and Google Docs add-ins, and mobile keyboards. Paid plans add plagiarism and AI-text detection, a shared style guide, brand tones, snippets and analytics.
- Best for
- Individuals and teams who want grammar, tone and rewriting help inside the apps they already use
- Pricing
- Free tier, then Pro at £10 per member per month billed annually (£25 billed monthly); Enterprise is contact sales
- Runs on
- WebAndroid
Strengths and trade-offs
Strengths
- Free tier covers proofreading, tone detection and 100 AI prompts
- Apps for Windows, Mac, browsers, MS Office, Google Docs and mobile
- Style guide and brand tones to keep team writing consistent
- States user content is not sold or used to train third-party models
Trade-offs
- Pro costs £25/month monthly; the £10 rate requires annual billing
- AI prompts are capped: 100/month on Free, 2,000/member/month on Pro
- SSO, DLP, audit logs and BYOK encryption are Enterprise-only
- Enterprise pricing is not published — contact sales required
How Grammarly markets itself
A structured read of the promise, proof and page design on Grammarly’s captured homepage.
Homepage capture
“Think big. We'll take care of the details.”
- Angle: Outcome / benefit-led
- Hero: Product screenshot
Pricing
Published plans and prices from Grammarly’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Pricing transparency
Whether real prices are published, self-serve signup exists, and usage costs are knowable without a sales call.
Customer sentiment
Third-party ratings, shrunk toward the catalogue mean by review volume and corroborated across independent sources.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
Openness
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
Maintenance
Release cadence and repository activity. Scored and shown, but not part of the composite — it is only measurable for open repositories.
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Where this comes from
The Grammarly pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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Is this your product?
Claim Grammarly to manage its profile. Claiming lets you suggest edits to the descriptive fields — it never changes scores or rankings.