Grammarly
AI writing assistant trusted by 30 million daily users for grammar and clarity
What is Grammarly?
Grammarly is the most widely used AI writing assistant in the world, with 30 million daily active users and a browser extension that works across virtually every writing surface — Gmail, Google Docs, LinkedIn, Slack, WordPress, and more. The combination of ubiquity and effectiveness has made it the default grammar tool for professionals, students, and non-native English speakers alike.
The free tier catches grammar and spelling errors competently. Grammarly Premium adds advanced suggestions for clarity, engagement, delivery tone, and vocabulary. The Tone Detector analyzes how your message will be perceived before you send it — invaluable for professional emails and performance reviews. GrammarlyGO (the generative AI feature) now allows one-click rewrites, paragraph generation, and response suggestions.
Grammarly Business adds team-level Style Guides — custom rules that ensure brand voice consistency across all team writing. This is the brand voice feature of Jasper implemented at the grammar layer rather than the generation layer. For organizations where employees write customer-facing communications, Grammarly Business ensures consistency without requiring a content creation tool.
Key Features
- Real-time grammar, spelling, and punctuation correction
- Tone Detector
- Clarity and conciseness suggestions
- Vocabulary enhancement
- Plagiarism detection (Premium)
- GrammarlyGO (generative AI rewrites and suggestions)
- Style Guides (Business plan)
- Browser extension (Chrome, Firefox, Safari, Edge)
- Desktop app for Windows and Mac
- Microsoft Word and Google Docs add-ins
Pros & Cons
Pros
- Works everywhere — browser extension covers Gmail, Slack, LinkedIn, docs, and more
- Free tier is genuinely useful for basic grammar and spelling
- Tone Detector helps calibrate email and professional communication tone
- 30 million daily users — the most battle-tested AI grammar tool
Cons
- Suggestions can be overzealous — sometimes flags correct informal writing
- Free plan lacks the advanced suggestions that make Premium worthwhile
- Premium at $12/mo is reasonable but pricier than LanguageTool ($5.83/mo)
- GrammarlyGO generative features are weaker than dedicated AI writing tools
Pricing
Model: Subscription
| Plan | Price | Key Limits |
|---|---|---|
| Free | $0/mo | Basic grammar and spelling checks |
| Premium | $12/mo | Advanced suggestions, tone, clarity, GrammarlyGO |
| Business | $15/user/mo | All Premium + Style Guides, analytics, SAML SSO |