Grammarly
An AI writing assistant offering real-time grammar, spelling, style, and tone corrections across browsers, apps, and devices. Covers everything from short emails to long-form documents, with generative AI via Grammarly GO for drafting and rewriting.
Overview
Grammarly is an AI-powered writing assistant launched in 2009, now used by over 30 million people across education, professional, and personal contexts. Originally a grammar checker, it has expanded into a broader communication platform combining real-time correctness checking with generative AI (Grammarly GO) for drafting, rewriting, and ideation. Its browser extensions, desktop apps, and keyboard integrations give it broad coverage across writing contexts, from Gmail and Slack to Google Docs and Microsoft Word. Where tools like QuillBot focus on paraphrasing and ProWritingAid on deep style analysis, Grammarly’s main differentiator is inline correction across a wide range of apps without switching context. Note: Grammarly recently renamed its “Premium” plan to “Pro” and consolidated its “Business” plan into Pro (up to 149 seats), with Enterprise for larger organizations.
Core Features
Real-Time Grammar & Spelling Correction
Catches 250+ types of errors, from basic typos and subject-verb disagreement to contextual mistakes like homophone confusion and incorrect word choice. Suggestions appear as you type across supported applications via browser extension or desktop app. Coverage varies by application; some text fields have limited support.
Tone Detection & Style Enhancement
Analyses your writing’s perceived tone, friendly, formal, confident, concerned, and flags when it may not match your intent. Pro users get full-sentence rewrites for clarity, conciseness, and engagement. Tone detection is available on the free plan in limited form; full rewrite suggestions require Pro.
Grammarly GO (Generative AI)
Compose, rewrite, ideate, and reply with AI directly in your workflow, generate email responses from bullet points, rewrite paragraphs for different audiences, brainstorm ideas, and adjust message length without leaving your current application. Free plan includes 100 AI prompts/month; Pro includes 2,000/month; Enterprise is unlimited.
Plagiarism Detection
Compares your text against billions of web pages and academic databases to identify potential similarity. Receive percentage scores, source links, and citation suggestions. Available on Pro and Enterprise plans only, not included in the free tier. Not a replacement for dedicated academic tools like Turnitin, but useful as a supplementary check.
Cross-Platform Integration
Works across Gmail, Outlook, Google Docs, Microsoft Word, Slack, LinkedIn, Salesforce, and 500+ other apps via browser extensions for Chrome, Safari, Firefox, and Edge, plus native desktop apps for Windows and macOS and a keyboard app for iOS and Android. Coverage is broader than most grammar tools, though depth of integration varies by application, some text fields show only basic corrections.
Team Style Guides & Analytics
Pro plan (1–149 seats) includes style guides for brand voice consistency, custom tone profiles, and an admin analytics dashboard to track team writing trends. Enterprise adds advanced access controls, confidential project labelling, data loss prevention, and SSO. Style guides are exclusive to Pro and above, not available on the free plan.
Use Cases
Professional Email & Communication
Catch grammar errors and tone mismatches in workplace correspondence before sending. Grammarly works inline in Gmail, Outlook, and Slack, flagging issues without requiring you to copy text to a separate editor. Tone detection helps identify when a message may read as more aggressive or passive than intended.
Academic Writing & Research
Students and researchers use Grammarly Pro for thesis editing, dissertation proofreading, and manuscript preparation. Plagiarism detection provides a supplementary check before submission, though it is not a substitute for institutional tools like Turnitin. Many universities provide free access via campus licensing, worth checking before subscribing.
Content Marketing & Copywriting
Polish blog posts, landing pages, and social content for grammar and tone consistency. Brand style guides (Pro and above) help distributed content teams maintain a consistent voice. Grammarly GO can assist with first-draft generation and headline variations, though for long-form or nuanced content, dedicated writing AI tools typically produce stronger output.
Non-Native English Writers
Non-native English speakers use Grammarly’s inline corrections and explanations to catch errors in context, expand vocabulary through synonym suggestions, and build familiarity with English grammar patterns. The explanation attached to each suggestion provides reasoning, which is useful for learning over time. Covers US, UK, Canadian, and Australian English dialects.
Pricing
- Basic grammar & spelling
- Punctuation correction
- Conciseness suggestions
- Tone detection (limited)
- Browser extension & desktop app
- Grammarly GO – 100 AI prompts/month
- Everything in Free
- Full-sentence rewrites & clarity suggestions
- Vocabulary enhancement
- Tone adjustments
- Plagiarism detection
- Grammarly GO – 2,000 AI prompts/month
- Style guides & brand tone settings (1–149 seats)
- Admin analytics dashboard
- Everything in Pro
- Unlimited Grammarly GO AI prompts
- Advanced access controls & custom user roles
- Confidential project labelling
- Data loss prevention settings
- SSO & SCIM provisioning
- SOC 2 Type II compliance
- Dedicated account manager
Why Choose Grammarly?
Grammarly’s main practical advantage is breadth of integration it works inline across more applications than most alternatives, without requiring you to copy text to a separate editor. Its tradeoff is that it only supports English, and its generative AI features are less capable than dedicated writing AI tools for complex tasks.
Broader App Integration Than Most Alternatives
Grammarly integrates with 500+ apps and websites via browser extension and desktop app, covering Gmail, Outlook, Slack, Google Docs, Word, LinkedIn, Salesforce, and more. Alternatives like ProWritingAid and LanguageTool have narrower integration footprints; LanguageTool supports multiple languages but has fewer app integrations. The practical result is corrections appear in context without switching applications.
Context-Aware Suggestions Beyond Basic Spell-Check
Grammarly’s suggestions account for sentence context, flagging when a correctly spelled word is the wrong choice, when tone shifts mid-message, or when a sentence structure is technically correct but hard to parse. This level of contextual checking goes beyond what a standard OS spell-checker provides, though it occasionally produces false positives in technical or domain-specific writing.
Grammarly GO Works Where You Already Write
Grammarly GO’s generative AI is accessible inline, inside Gmail, Google Docs, Slack, and other supported apps, without switching to a separate chat interface. For short-form drafting tasks like email replies or message rewrites, this reduces friction compared to copying content into ChatGPT or Claude. For longer or more complex writing tasks, dedicated AI tools generally produce better results.
Style Guides for Team Brand Consistency
The Pro plan (covering teams up to 149 seats) includes style guides that flag banned phrases, enforce capitalization rules, and maintain terminology standards across the team. Analytics show usage patterns and writing trends. This is useful for content teams and agencies where multiple writers produce customer-facing copy, comparable in scope to Microsoft Editor’s business features, but with broader integration coverage.
Product Details
Pros
- 500+ app integrations via extension and desktop app
- 250+ error types detected with contextual awareness
- Tone detection available on free plan
- Grammarly GO inline AI (2,000 prompts/month on Pro)
- Style guides and brand tone controls on Pro plan
- Useful for non-native English speakers with explanations per correction
Cons
- English-only
- Monthly billing ($30/mo) is 2.5× the annual rate ($12/mo)
- Plagiarism checker excluded from free plan
- Can be overly prescriptive on creative or technical style
- Privacy concerns when processing sensitive or confidential documents
- Occasional false positives in domain-specific or technical writing
- Grammarly GO less capable than ChatGPT or Claude for complex writing tasks