Grammarly
Writing assistant that checks grammar, clarity and tone across browsers, desktop apps and mobile keyboards.
Overview
Grammarly is a writing assistant that checks spelling, grammar, punctuation, clarity and tone wherever you type, through a browser extension, Windows and Mac desktop apps, a Microsoft Word add-in and a mobile keyboard. It is used by students, professionals and customer-facing teams, and the extension works inside Gmail, Google Docs, LinkedIn and most web apps, which is its main advantage over an editor's built-in checker.
The Free plan covers core spelling and grammar with a small monthly allowance of generative AI prompts. Pro adds full-sentence rewrites, tone adjustment, vocabulary suggestions, a plagiarism checker and a much larger AI prompt allowance. Enterprise adds style guides, brand tones, SSO and admin analytics. Grammarly acquired the Coda document platform in late 2024 and the Superhuman email app in 2025 as it repositions toward a broader AI productivity suite.
Pro costs $30 per month billed monthly or $12 per month billed annually, a gap that makes annual billing the sensible choice for regular users. Team pricing is per member. Grammarly is English-centric and cloud-based, so text is sent to its servers, which some organizations restrict, and its suggestions can be overzealous on deliberately informal or technical writing.
Key features
AI
- AI assistant
- AI content generation
Platforms
- Mobile app
- Desktop app
- Browser extension
Security
- SSO / SAML
Writing
- Grammar checker
- Tone & rewrite suggestions
- Plagiarism checker
- Integrations
- Gmail, Google Workspace, Microsoft 365, Outlook
- Platforms
- Web, Windows, macOS, iOS, Android, Browser extension
Pros & cons
Strengths
- Works in almost any app through the extension, desktop apps and mobile keyboard
- Accurate grammar and clarity suggestions with explanations
- Tone detection and full-sentence rewrites on Pro
- Plagiarism checker included in Pro
- Usable Free plan for basic spelling and grammar
Limitations
- Monthly billing is $30, more than double the annual rate
- English-centric with limited support for other languages
- Text is processed in the cloud, which some organizations restrict
- Suggestions can be heavy-handed on informal or technical writing
Pricing
Freemium. Free plan; Pro is $30 per month billed monthly or $12 per month billed annually ($144 per year); Enterprise pricing is custom.
Free
Free
Core writing checks at no cost.
- Spelling, grammar and punctuation
- Basic tone detection
- Limited monthly generative AI prompts
Pro
Popular$30/user/mo
Per person; $12 per month ($144 per year) when billed annually.
- Full-sentence rewrites and tone adjustments
- Vocabulary and fluency suggestions
- Plagiarism checker
- Larger generative AI prompt allowance
Enterprise
Custom
Custom pricing for larger organizations.
- Style guides and brand tones
- SAML SSO and admin controls
- Team analytics and dedicated support
Prices are listed in USD and can change. Confirm current pricing on the vendor’s pricing page.
Best for
A good fit if you are
- Professionals writing emails, reports and messages in English all day
- Students who need grammar checking and a plagiarism checker
- Support and sales teams that want consistent tone in customer messages
Not ideal if you
- Writers working mainly in languages other than English
- Organizations that cannot send documents to a third-party cloud
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Grammarly
From $30/mo · Free plan