Grammarly Inc / grammarly.com
AI writing assistant that checks grammar, style, tone, and clarity across browsers, desktop apps, and mobile devices.
Free plan
Yes
API access
No
Open source
No
Platforms
5
Grammarly is one of the few AI-adjacent tools that has successfully crossed from utility into daily habit for a large number of writers. With over 30 million daily active users, it is embedded into browsers, email clients, word processors, and messaging apps, which means many people use it without consciously opening a separate tool.
The core product is a writing assistant that catches grammar, spelling, punctuation, and style issues in real time. What distinguishes it from a basic spell-checker is context-awareness. Grammarly understands not just whether a sentence is grammatically correct but whether it is clear, concise, and appropriate for the intended tone. Tone detection tells you how writing is likely to come across emotionally, which is useful for professional emails where the difference between direct and curt genuinely matters.
The free plan covers grammar and spelling checks and is useful for everyday writing. The Pro plan adds full-sentence rewrites, vocabulary enhancement, plagiarism detection, and GrammarlyGO, the generative AI feature that can draft, rewrite, or expand text. At $12/month annually, Pro is competitively priced.
GrammarlyGO, the generative layer, is weaker than dedicated AI writing tools. It produces passable drafts and paraphrases, but the output is mechanical compared to ChatGPT or Claude. Grammarly's strength has always been correcting and polishing existing text, not generating it from scratch. The generative features are a useful bonus, not the primary reason to subscribe.
Grammarly runs as writing assistant software built around text workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on web, windows, and mac.
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The capabilities that matter most for teams evaluating Grammarly.
Catches grammar, spelling, punctuation, and style issues as you type across browsers and word processors.
Analyses emotional tone of writing and flags how it may come across to the reader.
Generative AI feature for drafting, rewriting, or expanding text on the Pro plan.
Free with basic checks. Pro $12/month billed annually ($30/month billed monthly). Business $15/member/month with team features and style guides.
Model
Freemium
Starting price
$12/mo
Free trial
No
ChatGPT and Claude are better for generating and rewriting content at scale. Hemingway Editor is a free readability-focused alternative. ProWritingAid offers deeper analysis for fiction and long-form writing.
A side-by-side look at the closest alternative in this category.
Key facts about model providers, platforms, and team support.
Model Provider
Grammarly
Platforms
Web, Windows, Mac, iOS, Android
Deployment
SaaS
Integrations
Microsoft Word, Google Docs, Chrome, Firefox, Safari, Edge, Slack, Gmail
Team Collaboration
Yes
Launch Year
2009
Compliance signals and data-handling notes as reported by the vendor.
Business plan includes SSO and admin controls. Enterprise with data handling agreements.
The browser extension reads all text typed in a browser, including potentially sensitive content. Review settings and consider disabling for confidential work.
Editorial Verdict
Grammarly is the best tool for real-time writing correction embedded in your existing workflow. For generating content from scratch, ChatGPT or Claude are stronger. Many users benefit from using both.
Last verified July 24, 2026.
The Business plan adds shared style guides, brand tone customisation, and analytics for monitoring writing quality across a team. For marketing and customer service teams with strong editorial standards, these features have real value.
Integration breadth is where Grammarly stands out most practically. It works across Chrome, Safari, Firefox, and Edge browsers, in Microsoft Word and Outlook, in Google Docs, in Slack, and in most web text editors. This ubiquity means the tool gets used rather than sitting idle as a separate application.
Privacy deserves attention. The browser extension reads everything typed in a browser, potentially including passwords, private messages, and confidential documents. Review the privacy policy and consider excluding sensitive contexts.
Free with basic checks. Pro $12/month billed annually ($30/month billed monthly). Business $15/member/month with team features and style guides.
Free plan with 10 rewrites/day. Plus $13.99/month. Unlimited $19.99/month billed monthly. Team plans available.
Business plan includes SSO and admin controls. Enterprise with data handling agreements.
Review Wordtune's data handling policy. Text entered for rewriting is processed by AI21 Labs' infrastructure.
The browser extension reads all text typed in a browser, including potentially sensitive content. Review settings and consider disabling for confidential work.
Review privacy policy before using with confidential content. Text is processed by AI21 Labs' servers.
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