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Featured AI
Writing

Grammarly

AI writing assistant

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  • PriceFree-$30/mo
  • Founded2009
  • HQSan Francisco USA
  • Employees1000+

About Grammarly

AI writing assistant for grammar spell-check and tone suggestions across browsers and apps.

Key Features

  • Real-time grammar, spelling, and punctuation correction
  • Works across browsers, desktop apps, email, and mobile keyboards
  • Tone detection and delivery suggestions
  • Generative AI drafting and rewriting with prompts
  • Clarity, conciseness, and word-choice improvements
  • Plagiarism detection against billions of pages (Pro)
  • Style guides and snippets for teams
  • Analytics on team writing quality (Business)

Pros & Cons

Pros

  • Best-in-class grammar accuracy in English
  • Works everywhere — no workflow change required
  • Free tier genuinely covers correctness basics
  • Tone feedback prevents real communication mishaps
  • AI rewriting integrated where you already type

Cons

  • Pro pricing (~$12/month annual) exceeds casual value
  • Suggestions occasionally flatten distinctive voice
  • English-only for deep checking
  • Cloud processing of text raises confidentiality questions

Frequently Asked Questions

Is Grammarly free?
Yes — the free version corrects grammar, spelling, and punctuation with basic clarity suggestions and limited AI prompts. Pro at about $12/month (annual billing) adds full-sentence rewrites, tone adjustment, plagiarism detection, and expanded AI use.
Does Grammarly work in Google Docs and email?
Yes — via browser extensions and desktop apps, Grammarly works in Gmail, Google Docs, Outlook, Word, Slack, LinkedIn, and most text fields, plus mobile keyboards on iOS and Android.
Is Grammarly safe for confidential documents?
Grammarly encrypts text, holds SOC 2 and ISO 27001 certifications, and does not sell user content or use it to train third-party models. Because processing happens in the cloud, regulated industries should use Business-tier controls or exclude sensitive applications.
Grammarly vs ChatGPT for writing?
ChatGPT drafts and rewrites on request; Grammarly corrects continuously everywhere you type without prompting. They complement: generative drafting in ChatGPT, always-on polish and tone checking through Grammarly.
Does Grammarly support languages other than English?
Deep checking remains English-focused (with dialect options), though Grammarly now translates and handles basic correction in several languages. For full multilingual grammar checking, LanguageTool is the stronger choice.

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Best For

Grammarly is best for professionals, students, and non-native English speakers who write all day across email, docs, and chat — real-time correction and tone guidance everywhere you type, without changing tools.

Use Cases

Catching grammar and spelling errors across email, docs, and Slack
Adjusting tone from blunt to diplomatic before sending
Rewriting sentences for clarity and concision with AI
Plagiarism checking for academic and professional work
Enforcing brand style guides across company writing

Pricing Details

Grammarly free corrects grammar, spelling, and basic clarity with limited AI prompts monthly. Pro costs about $12/month billed annually (roughly $30 monthly) adding full rewrites, tone transforms, plagiarism checking, and expanded AI credits. Business runs about $15/user/month with style guides and analytics. Students often access Pro via institutions.

Security & Trust

Grammarly is SOC 2 Type 2 and ISO 27001 certified, encrypts text in transit and at rest, and states user text is not sold or used to train third-party models. Text is processed in the cloud, so regulated environments should use the Business tier’s controls or block sensitive fields — its editor respects blocked apps and fields you configure.

Alternatives To Consider

LanguageTool covers 30+ languages with open-source roots and lower prices, while ProWritingAid offers deeper stylistic reports for long-form authors at a one-time price option. Microsoft Editor bundles into 365, and ChatGPT or Claude rewrite well but lack always-on inline correction. Hemingway remains the free clarity coach.

Editorial Verdict

Grammarly is still the best writing assistant for everyday professional English — accurate, ubiquitous, and now sensibly augmented with AI rewriting. Strong writers may find it fussy and its voice-flattening real. For anyone whose career runs on email and docs, Pro pays for itself in avoided embarrassments.

Sources & Review Notes

Last reviewed: July 26, 2026