Grammarly
AI-powered writing assistant for everyone
Grammarly is the world's most popular AI writing assistant, helping over 30 million people write clear, confident, and mistake-free text every day — from quick emails to long-form documents — across every app and platform they use.
Visit GrammarlyWhat is Grammarly?
Grammarly is an AI-powered writing assistant founded in 2009 by Alex Shevchenko and Max Lytvyn. What started as a grammar and spell checker has evolved into a comprehensive communication platform used by over 30 million people daily and trusted by more than 70,000 professional teams worldwide. Grammarly's core mission is simple but ambitious: help everyone communicate more effectively, regardless of their writing skill level or the language context they are writing in.
At its foundation, Grammarly provides real-time checking for grammar, spelling, punctuation, and clarity. But what sets it apart from basic spell checkers is the depth of its analysis. Grammarly evaluates sentence structure, word choice, passive voice overuse, wordiness, hedging language, and dozens of other stylistic patterns that affect readability. It doesn't just tell you something is wrong — it explains why and offers a one-click fix. The Premium tier adds full-sentence rewrites, where Grammarly restructures entire sentences for better flow, conciseness, or impact without changing your meaning.
In 2023, Grammarly launched GrammarlyGO, its generative AI layer built on large language models. GrammarlyGO transforms Grammarly from a reactive editor into a proactive writing partner. You can ask it to compose emails from bullet points, rewrite paragraphs in a more formal or casual tone, summarize lengthy documents into key takeaways, brainstorm ideas for blog posts, or generate replies to messages — all within the apps you already use. GrammarlyGO respects your personal voice profile and adjusts its output to match your preferred communication style, making it feel less like a generic AI and more like a personalized assistant.
What truly differentiates Grammarly from competitors is its ubiquity. The Grammarly browser extension works across virtually every website and web application — Gmail, Google Docs, LinkedIn, Slack, Notion, WordPress, and thousands more. Native desktop applications for Windows and macOS bring Grammarly's suggestions into any application on your computer, including Microsoft Office. Mobile keyboards for iOS and Android extend the experience to phones and tablets. For teams, the Grammarly Business plan adds shared style guides, brand tone profiles, an analytics dashboard, and admin controls that ensure everyone on the team writes consistently. No other AI writing tool matches this level of platform coverage and seamless integration into existing workflows.
Key Features
Grammar & Spelling
Grammarly's core engine catches hundreds of grammar, spelling, and punctuation errors in real time with industry-leading accuracy. Beyond simple typos, it identifies subject-verb agreement issues, incorrect article usage, misplaced modifiers, comma splices, and contextual spelling errors that basic spell checkers miss entirely. One-click fixes make corrections effortless.
Tone Detection
A feature unique to Grammarly among writing assistants. Before you hit send, Grammarly analyzes the emotional tone of your message and displays how it will likely be perceived — confident, friendly, formal, diplomatic, concerned, or dozens of other tones. This is especially valuable for sensitive emails, client communications, and cross-cultural workplace writing where tone missteps can have real consequences.
GrammarlyGO (Generative AI)
Grammarly's generative AI feature composes, rewrites, and ideates text on demand. Draft emails from bullet points, rewrite paragraphs in a different tone, summarize long documents, or brainstorm content ideas — all inline within the apps you already use. GrammarlyGO respects your voice profile so outputs match your personal communication style rather than sounding generic.
Plagiarism Detection
Premium and Business users can check their writing against billions of web pages and ProQuest's academic database to identify unintentional plagiarism. Grammarly flags matching passages, shows the original source, and suggests how to properly cite or rephrase the content. Essential for academic papers, blog posts, and any published content where originality matters.
Style Guide (Business)
Grammarly Business lets teams create custom style guides that enforce brand-specific writing rules across the entire organization. Define preferred terminology, banned words, tone guidelines, and formatting standards. Every team member's writing is automatically checked against the style guide in real time, ensuring consistent brand voice without manual review cycles.
Browser Extension
The Grammarly browser extension is the most widely installed writing tool extension with over 30 million users. It works on virtually every website and web application — Gmail, Google Docs, LinkedIn, Slack, Notion, WordPress, Twitter, Reddit, and thousands more. Suggestions appear as unobtrusive inline underlines, and GrammarlyGO prompts are accessible via a floating icon in any text field.
How to Get Started with Grammarly
Getting started with Grammarly takes less than two minutes. Sign up for a free account at grammarly.com, install the browser extension for Chrome, Firefox, Safari, or Edge, and Grammarly immediately begins checking your writing across every website you visit. No configuration is needed — it works out of the box.
For deeper integration, download the Grammarly desktop app for Windows or macOS, which extends checking to native applications like Microsoft Word, Outlook, and any text editor on your computer. On mobile, install the Grammarly Keyboard for iOS or Android to get real-time suggestions while typing on your phone — in messaging apps, email, social media, or anywhere else you type.
Once installed, Grammarly works silently in the background. Errors are underlined in real time, and clicking an underline shows the suggestion with an explanation. For GrammarlyGO features, look for the small Grammarly icon in any text field — click it to access generative AI prompts like "Improve it," "Make it shorter," "Change tone," or type a custom instruction. Premium users can set their voice profile in the Grammarly dashboard to personalize all suggestions and GrammarlyGO outputs to match their communication style.
Pricing
Grammarly offers a generous free tier and two paid plans. The Free plan is one of the best no-cost writing tools available, while Premium and Business unlock advanced AI features and team capabilities.
| Plan | Price | Key Features |
|---|---|---|
| Free | $0 | Grammar, spelling, and punctuation checks; basic tone detection; limited GrammarlyGO prompts (100/month); browser extension, desktop app, and mobile keyboard |
| Premium | $12 / month | Everything in Free + full-sentence rewrites, advanced clarity and conciseness suggestions, vocabulary enhancement, tone adjustments, plagiarism detection, 1,000 GrammarlyGO prompts/month, voice profile personalization |
| Business | $15 / user / month | Everything in Premium + custom style guides, brand tones, analytics dashboard, SAML SSO, admin controls, priority support, 2,000 GrammarlyGO prompts/user/month, centralized billing |
Pricing as of April 2026 with annual billing. Monthly billing is higher. Check grammarly.com/plans for current rates.
Worked Examples: Grammarly in Action
Example 1 — Email polishing: You draft a quick email to a client: "Hey, I wanted to follow up on the proposal we sent last week, let me know if you have any questions or concerns about it." Grammarly flags the comma splice and suggests splitting into two sentences. Tone detection shows the email reads as "informal" and "friendly." If you need it more professional, GrammarlyGO can rewrite it as: "I'm following up on the proposal we shared last week. Please don't hesitate to reach out with any questions or feedback."
Example 2 — Academic writing: A student writes: "The data clearly shows that there is a significant correlation between the two variables." Grammarly suggests removing "clearly" (hedging language), replacing "there is" with a more direct construction, and flagging the passive voice. The improved version: "The data demonstrates a significant correlation between the two variables." The plagiarism checker then verifies the surrounding paragraphs against academic databases.
Example 3 — Team consistency: A marketing team of 15 writers uses Grammarly Business with a custom style guide. The guide specifies: always write "log in" (two words, verb) not "login" when used as a verb, never use "utilize" when "use" works, and maintain a confident-but-approachable brand tone. Every writer gets these corrections automatically, eliminating the need for a dedicated copy editor to enforce brand standards across hundreds of pieces of content per month.
Pros & Cons
Pros
- Works everywhere — browser extension, desktop apps, mobile keyboard, Google Docs, Microsoft Office, Slack, and thousands of other platforms with zero context-switching
- Excellent grammar and spelling accuracy that consistently outperforms built-in checkers in Word and Google Docs
- Tone detection is a genuinely unique feature that helps avoid miscommunication in emails and professional writing
- GrammarlyGO brings practical generative AI directly into your existing workflow without requiring a separate app
- Trusted by over 30 million daily users and 70,000 teams — battle-tested at massive scale with a proven track record
Cons
- Premium subscription required for advanced features like full-sentence rewrites, plagiarism detection, and expanded GrammarlyGO prompts
- GrammarlyGO has monthly prompt limits (100 Free, 1,000 Premium, 2,000 Business) that heavy users may exhaust
- Can be overly prescriptive for creative writing, fiction, and literary prose — suggestions sometimes flatten distinctive voice
- Desktop app and browser extension can consume noticeable system resources, particularly on older machines or with many browser tabs open
Alternatives to Grammarly
Grammarly is the market leader, but several alternatives serve different niches and budgets. Here are four worth considering.
Jasper
An AI marketing platform focused on generating on-brand content at scale. Jasper is better for content creation from scratch, while Grammarly excels at polishing existing writing. Many teams use both together.
ChatGPT
OpenAI's conversational AI is more powerful for drafting long-form content, brainstorming, and complex writing tasks. However, it lacks Grammarly's always-on inline checking and seamless multi-platform integration.
Notion AI
Built directly into Notion's workspace, Notion AI is ideal for teams already using Notion for documentation and project management. It offers writing assistance within Notion but doesn't extend to other apps like Grammarly does.
Claude
Anthropic's AI assistant excels at nuanced, long-form writing and careful editing. Claude is stronger for complex documents and research writing, while Grammarly wins on convenience and real-time inline corrections.
Frequently Asked Questions
What is Grammarly?
Grammarly is an AI-powered writing assistant founded in 2009 that helps you write clear, mistake-free, and impactful text. It checks grammar, spelling, punctuation, clarity, tone, and style in real time across virtually every platform — browser extensions, desktop apps, mobile keyboards, and direct integrations with Google Docs, Microsoft Office, and Slack. With over 30 million daily active users, Grammarly is the most widely adopted AI writing tool in the world. Its 2023 addition of GrammarlyGO brought generative AI capabilities that allow it to compose, rewrite, and brainstorm text on demand.
How much does Grammarly cost?
Grammarly offers three tiers. The Free plan covers basic grammar, spelling, and punctuation checks with no cost or credit card required — it also includes limited GrammarlyGO prompts (100 per month). Grammarly Premium costs $12 per month with annual billing and adds full-sentence rewrites, tone detection, vocabulary enhancement, plagiarism detection, and 1,000 GrammarlyGO prompts per month. Grammarly Business costs $15 per user per month and adds custom style guides, brand tones, analytics dashboard, SAML SSO, admin controls, and 2,000 GrammarlyGO prompts per user per month.
What is GrammarlyGO?
GrammarlyGO is Grammarly's generative AI feature that goes beyond checking your writing to actively composing, rewriting, and ideating text. You can prompt it to draft emails from bullet points, rewrite paragraphs in a different tone (formal, casual, confident, friendly), summarize long documents, or brainstorm ideas — all within the apps you already use. GrammarlyGO respects your voice profile, so its outputs match your personal communication style rather than sounding like generic AI text. Free users get 100 prompts per month, Premium users get 1,000, and Business users get 2,000.
Does Grammarly work with Google Docs and Microsoft Word?
Yes. Grammarly integrates natively with both Google Docs (via the browser extension) and Microsoft Word (via a dedicated add-in for Windows and macOS). In Google Docs, Grammarly suggestions appear as inline underlines with a sidebar panel for detailed explanations. In Microsoft Word, the Grammarly add-in provides the same real-time checking experience within the native application. Grammarly also works with Microsoft Outlook, PowerPoint, and Excel for comprehensive Office suite coverage.
Is Grammarly accurate?
Grammarly is widely regarded as the most accurate consumer grammar checker available. Independent testing consistently shows it catches 85-95% of common grammar, spelling, and punctuation errors, significantly outperforming built-in spell checkers in Word and Google Docs. Its tone detection and clarity suggestions are effective for standard business and academic writing, though they can sometimes be overly prescriptive for creative or literary prose where unconventional style is intentional.
How does Grammarly compare to ChatGPT for writing?
Grammarly and ChatGPT serve different writing needs and complement each other well. Grammarly excels at polishing existing text — it works inline wherever you write, catching errors and improving clarity in real time without requiring you to switch apps or copy-paste text. ChatGPT is better for generating content from scratch, answering complex questions, and handling creative tasks that require extensive context. For most professionals, the ideal workflow is using ChatGPT to draft content and Grammarly to polish it. Grammarly's always-on browser extension gives it a significant usability advantage for everyday writing.
Is Grammarly safe to use with sensitive documents?
Grammarly processes text on its servers to provide AI-powered suggestions, which means your writing is transmitted to Grammarly's infrastructure. The company maintains SOC 2 Type II compliance, encrypts data in transit and at rest, and for Business plan customers offers SAML SSO, advanced admin controls, and the option to disable snippet storage. Free and Premium plans also encrypt data but offer fewer administrative controls. If you work with highly confidential documents — legal, medical, or classified material — review Grammarly's security whitepaper and evaluate whether the Business plan's enterprise controls meet your compliance requirements before use.
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