Grammarly
by Grammarly Inc.
AI writing assistant for clear, effective communication everywhere.
Score
Score
Our verdict
Grammarly has evolved from a grammar checker into a comprehensive AI writing assistant that works across virtually every platform, from email to Google Docs to Slack. It excels at real-time writing improvement with tone detection, clarity suggestions, and full-text rewriting. The main caveat is the premium pricing for individual users and that generative AI features on the free tier are limited.
Overview
Screenshot
Score breakdown
Overall score
Scores are editorial assessments by the Compare Best AI team on a 0–10 scale.
Expert review
CBAI Editorial Team
Compare Best AI · Editorial Team
Grammarly has transformed from a simple spell-checker into a comprehensive AI communication platform that assists with everything from grammar and punctuation to tone adjustment, full-text rewriting, and generative AI content creation. With over 30 million daily active users, it's the most widely adopted writing assistant in the world, working seamlessly across browsers, desktop apps, mobile keyboards, and enterprise platforms.
How we tested
Days tested
14 days
Tasks evaluated
- ·Email drafting and correction
- ·Blog post editing
- ·Tone adjustment testing
- ·Plagiarism check accuracy
- ·GrammarlyGO generation quality
- ·Browser extension performance
Method
Side-by-side with ChatGPT for rewriting and ProWritingAid for grammar checking
Reviewer
CBAI Editorial Team
Plans & pricing
Free
Anyone wanting basic grammar and spelling assistance
- Grammar and spelling corrections
- Basic punctuation fixes
- Tone detection (limited)
- Browser extension
- Mobile keyboard
- No advanced suggestions
- No plagiarism detection
- No GrammarlyGO full access
Premium
Professionals wanting comprehensive AI writing assistance
- Everything in Free
- Advanced clarity suggestions
- Tone adjustment and rewriting
- Full GrammarlyGO access
- Plagiarism detection
- Vocabulary enhancement
- Word choice suggestions
- Formatting recommendations
Business
Teams needing consistent communication with brand controls
- Everything in Premium
- Brand style guide enforcement
- Team analytics dashboard
- Admin controls
- SAML SSO
- Priority support
- Custom style rules
Enterprise
Large organizations with compliance and governance needs
- Everything in Business
- SCIM provisioning
- Advanced security controls
- Custom deployment
- Dedicated account manager
- Compliance features
- API access
Pricing may vary by region. Always verify on the vendor's website.
Feature comparison
| Feature | Grammarly | ChatGPT | ProWritingAid |
|---|---|---|---|
| Writing Assistance | |||
| Real-time grammar correction | |||
| Tone detection | |||
| Plagiarism detection | |||
| AI Generation | |||
| Full-text rewriting | |||
| Creative content drafting | |||
| Integration | |||
| Works in every app (browser ext.) | |||
| Google Docs native | |||
| Team Features | |||
| Brand style guide | |||
| Pricing | |||
| Free tier | |||
Is it right for you?
Good fit for
Business professionals
Real-time email and document polishing ensures clear, professional communication across every platform.
Marketing and content teams
Brand style guides and tone adjustment keep all team output consistent and on-brand.
Students and academics
Grammar correction, clarity suggestions, and plagiarism detection improve academic writing quality.
Non-native English speakers
Contextual grammar explanations and fluency suggestions help improve English writing skills over time.
Customer support teams
Tone detection ensures customer-facing messages are empathetic, clear, and professional.
Less suited for
Long-form content creation
For drafting articles or blog posts from scratch, ChatGPT or Claude provide more capable generative AI.
Code writing
Grammarly is for natural language only; developers should use GitHub Copilot or Cursor instead.
Budget-conscious casual users
The free tier is limited; Premium at $12/month may not justify the cost for light, occasional writing.
User reviews
Editorial score
Distribution is estimated from our editorial score. Verified user reviews coming soon.
Use cases
Typical ways teams rely on this tool — from everyday tasks to specialized workflows.
- Business Communication
- Email Writing
- Content Editing
- Academic Writing
- Social Media
- Customer Support
- Technical Writing
Integrations
Reported connectors
Apps and services commonly connected out of the box or via official connectors.
- Chrome
- Firefox
- Edge
- Safari
- Google Docs
- Microsoft Word
- Microsoft Outlook
- Slack
- Gmail
- iOS
- Android
- macOS
- Windows
Privacy & compliance
Security & data practices
Highlights we track from the vendor's documentation. Always confirm current terms, subprocessors, and regional policies on their official site.
- SOC 2
- GDPR-ready
- SSO/SAML
Details
Category
Price
- Free
- Premium $12/mo
- Business $15/user/mo
- Enterprise custom
Free version
Best for
- Grammar, spelling, style and tone correction
- Professional email and document polish
- Brand tone consistency and compliance for teams
Frequently asked questions
Grammarly
Content & Design
Ready to get started?
Visit the Grammarly website to explore plans and start your free trial.
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