An AI writing assistant that combines grammar checking, tone rewriting, and generative text capabilities to help individuals and teams write clearly and consistently.
Review
What makes Grammarly work now is the combination of price and being always present. Pro is $12/month — among the cheapest in this category, and an order of magnitude below Jasper ($69) or Copy.ai Chat ($29). The browser extension runs in Gmail, Slack, Google Docs and almost any other text field, so you never change where you write. Without the open-the-tool, write, copy, paste cycle, it survives as a daily habit.
The free plan is genuinely usable too: grammar and spelling checks, tone detection, and 100 AI prompts a month. If you do not write a great deal of English, you may never need to pay. The reasons to move to Pro are the deeper features — full rewrites, clarity suggestions, plagiarism checking. The efficient order is to install the free version, find out what it does not cover, and pay only then.
Two limits, both worth settling before you adopt it. The first is language: Grammarly is designed around English, so it is not the tool to choose for proofreading Japanese, and expecting that will disappoint. The second is privacy — everything you type passes through the company’s servers, so environments handling confidential or unreleased material need to check internal policy first. Its generation features are also weaker than dedicated tools, so if your problem is getting to a first draft at all, Grammarly does not solve it. It works on the other side: raising the quality of what you already wrote.
- Best-in-class grammar, spelling, and style correction
- Browser extension works across virtually every web-based writing surface
- Tone adjustment and clarity rewrites improve communication quality
- Business plan includes style guides for brand consistency
- Generative AI features are weaker than dedicated tools like ChatGPT
- It is built around English; it is not the tool to pick for proofreading Japanese.
- Privacy concerns as all text passes through Grammarly servers
| Free tier | ✓ Free tier |
| Pricing model | subscription |
| Price (Pro) | $12 USD |
| Features | |
| Languages | en |
| API | ✓ Available Docs ↗ |
| Pricing Plans | Free$0/月文法・スペルチェック、トーン検出、AIプロンプト100回 Pro$12/月書き換え、明瞭さの提案、生成AI Enterprise要問合せスタイルガイド、管理機能 |
| Platforms | |
| Integrations | Chrome extension, Microsoft Word, Google Docs, Outlook, Slack, VS Code, Grammarly API, Figma |
| Homepage | https://www.grammarly.com |
Overview
Grammarly has evolved from a grammar checker into a full AI writing assistant, but its core strength remains its deeply trained understanding of English grammar, style, and clarity. The browser extension's ubiquity — working in Gmail, Slack, Google Docs, and virtually any text field in Chrome — makes it uniquely integrated into daily writing workflows without requiring any context switching. The Business tier's style guide feature allows organizations to enforce specific terminology and writing conventions automatically. However, its generative AI capabilities are relatively basic, and its English-only scope limits international adoption.
