Grammarly operates as an overlay on top of text editors and input fields. As users type, it analyses text in real time and surfaces suggestions through a sidebar or inline underlines. Users can accept, dismiss, or contextualise each suggestion. The AI writing features allow users to generate, rewrite, or adjust tone on selected text. In business plans, it enforces style guides and company-specific writing standards.
Grammarly
Grammarly is a writing assistance platform that uses AI to identify grammar, spelling, style, clarity, and tone issues in written text. Founded in 2009, it was among the early AI-powered writing tools to gain widespread consumer adoption, and has since expanded from a proofreading tool into a broader AI writing assistant.
It is available as a browser extension, desktop application, and via integrations with tools like Microsoft Word, Google Docs, and Slack. Grammarly operates across both consumer and business contexts, with a particular presence in professional communication, academic writing, and content production.
The product has expanded with Grammarly AI, which adds generative writing capabilities alongside its established editing features, competing more directly with tools like Notion AI and Microsoft Copilot in the writing assistant space.
Best For
- Professionals writing in English as a second language
- Content marketers and copywriters
- Students and academics
- Customer support teams
- Business communication teams with style requirements
How It Works
Key Features
Core Capabilities
- Grammar and spelling correction
- Clarity and conciseness suggestions
- Tone detection and adjustment
- Punctuation fixes
- Plagiarism detection (Premium)
Advanced Capabilities
- Generative AI writing and rewriting
- Custom style guide enforcement (Business)
- Full-sentence rewrites
- Browser and app integrations
- Team analytics and usage reporting
Pros & Cons
Pros
- Works across most web-based text inputs via extension
- Real-time suggestions with minimal workflow friction
- Effective at catching common stylistic issues
- Business plan supports team-wide style consistency
- Long-established product with high reliability
Cons
- Premium features require paid subscription
- AI suggestions can alter intended meaning
- Less effective for highly technical or domain-specific writing
- Generative features are less advanced than dedicated AI writers
- Data processed on Grammarly servers
Pricing
Grammarly offers a free plan with basic grammar and spelling corrections. Grammarly Premium unlocks advanced style, clarity, tone, and plagiarism features. Grammarly Business adds team management, style guide configuration, and reporting. All plans are available on monthly or annual billing cycles.
How It Compares
Grammarly sits between basic spell-checkers and full AI writing platforms. For editing and error correction, it is more specialised than ChatGPT or Claude. It competes with ProWritingAid for advanced editorial features. For generative writing, Jasper and Copy.ai are more capable, while Grammarly retains a stronger position in real-time editing and professional communication use cases.