Why it matters
- With 30 million daily active users, Grammarly is the industry-standard writing assistant — widely integrated and trusted.
- Catches not just typos but nuanced issues like unclear phrasing, passive voice overuse, and inconsistent tone.
- GrammarlyGO brings generative AI for rewriting, tone adjustment, and text generation alongside its proofreading core.
- The Grammarly Text Editor SDK and API let developers embed writing assistance into their own products.
Key capabilities
- Real-time proofreading: Grammar, spelling, punctuation, and sentence structure corrections as you type.
- Clarity and conciseness: Flags wordy sentences and suggests shorter, clearer alternatives.
- Tone detection: Identifies the emotional tone of writing (confident, formal, friendly) and suggests adjustments.
- GrammarlyGO: Generative AI for rewriting paragraphs, changing tone, drafting replies, and generating content from prompts.
- Plagiarism checker: Compares text against billions of web pages (Premium and Business plans).
- Style guides (Business): Custom organizational style rules that enforce consistent vocabulary and formatting.
- Platform coverage: Browser extension (Chrome, Firefox, Safari, Edge), Word add-in, Google Docs, Outlook, desktop app.
- Grammarly API: Embed writing assistance into developer applications via the Text Editor SDK.
Technical notes
- Platforms: Browser extension, Windows/macOS desktop app, Word add-in, Google Docs, iOS/Android keyboard
- API: Grammarly Text Editor SDK (embedding) and business API available
- Pricing: Free (basic checks); Premium ~$12/mo; Business ~$15/user/mo (annual)
- Privacy: Business plans offer data protection agreements; consumer tier data used for model improvement
- Founded: 2009; headquartered in San Francisco
Ideal for
- Professionals who write frequently — emails, reports, documentation, blog posts — and want real-time polish.
- Non-native English speakers who want to write with native-level clarity and correctness.
- Teams needing consistent voice and style across all outgoing communications with Business style guides.
Not ideal for
- Long-form content creation or full article drafting — Grammarly assists editing, not generation at scale (use Jasper or Writesonic for that).
- Technical writing with domain-specific jargon that Grammarly may flag incorrectly.
- Full document generation — Grammarly is a writing enhancement tool, not a content creation platform.
See also
- Jasper — AI content generation platform for marketing copy and long-form articles.
- Writesonic — AI writer for SEO-optimized blog posts and marketing content.
- QuillBot — AI paraphrasing and rewriting tool for academic and professional writing.