Grammarly
Overview
Grammarly is an AI writing assistant that checks grammar, spelling, style, and tone in real time and proposes improvements. Since 2009 it has been synonymous with English writing assistance, and as of 2026 it runs inside browser extensions, desktop apps, Microsoft Word, Google Docs, Gmail, Slack, and more. With GrammarlyGO at the center, Grammarly has evolved from a proofreader into a full generative-AI platform covering drafting, rewriting, summarizing, and tone shifting. Primary audience: anyone writing English for business, students, and non-native writers.
Key Features
1. Real-Time Grammar & Spell Checking
Grammarly's core strength: instant underlines and fixes for grammar, spelling, and punctuation as you type.
2. GrammarlyGO (Generative AI)
Prompt-driven text generation, rewriting, summarizing, and tone shifting (formal, casual, confident, etc.). 100 AI prompts/month on Free, 2,000 on Pro, unlimited on Enterprise.
3. Tone Detection & Brand Tone
Automatically detects how your writing reads (formal, friendly, confident, etc.). Business plans let teams define a shared brand tone so every member's writing stays consistent.
4. Plagiarism Checker (Pro and above)
Compares text against 16 billion+ web pages and academic databases to flag copied content or missing citations. Useful for academic work and public content.
5. Works Everywhere You Write
Chrome, Safari, and Edge extensions, Windows/Mac desktop apps, iOS/Android keyboards, and Microsoft Office integration—Grammarly shows up wherever you type.
Plans & Pricing (2026)
| Plan | Monthly | Highlights |
|---|---|---|
| Free | $0 | Core grammar/spell checking, 100 AI prompts/month |
| Pro | $12 (annual) or $30 (monthly) | Full features, 2,000 AI prompts/month, plagiarism checker, tone tuning |
| Enterprise | Custom (150+ seats) | Unlimited AI, SSO, audit logs, custom style guides |
Quarterly billing is also available at $20/month ($60/quarter).
Typical Use Cases
- Polishing English business emails and proposals
- Grammar checking and plagiarism review for academic papers
- Tone optimization for marketing copy
- Supporting non-native writers drafting English documents
- Raising baseline writing quality across a team
Strengths
- Industry-leading English proofreading accuracy
- Works everywhere from browsers to Microsoft Office
- Free plan is genuinely useful
- Intuitive tone detection and adjustment
- Makes non-native writing noticeably more persuasive
Weaknesses
- No Japanese proofreading (English only)
- Generative features trail dedicated tools like ChatGPT
- Monthly price is higher than competing proofreaders
- Free plan AI prompt quota is tight
Official Resources
- Website: https://www.grammarly.com
- Pricing: https://www.grammarly.com/plans