LanguageTool
AI-powered grammar, style, and spell checker for 30+ languages
Founded
2003
Starting Price
$0
Category
AI Writing & Content
Last updated April 27, 2026
About LanguageTool
LanguageTool is an open-source-based writing assistant that checks grammar, spelling, punctuation, and style in over 30 languages. Available as browser extensions, desktop apps, and integrations with Google Docs and Microsoft Word, it offers AI-powered paraphrasing and more than 20,000 additional writing rules for premium users.
Pros & Cons
Pros
- Supports 30+ languages — broadest multilingual grammar checking on the market
- Open-source core offers transparency and self-hosting option for privacy-conscious users
- Very affordable at half the price of Grammarly for comparable features
- Excellent browser and office integrations for seamless real-time checking
- AI-powered paraphrasing helps improve writing style beyond just fixing errors
Key Features
Multilingual Support
Checks grammar, spelling, and style in over 30 languages including English, German, French, Spanish, Dutch, and Polish
AI-Powered Paraphrasing
Rephrase sentences to be more formal, fluid, or concise using AI suggestions
Browser Extensions
Available for Chrome, Edge, Firefox, Safari, and Opera for real-time checking across all websites
Office Integrations
Works with Microsoft Word, Google Docs, LibreOffice, and email clients
Desktop Apps
Native applications for Windows and macOS with system-wide checking
Style & Tone Suggestions
Goes beyond grammar to improve writing style, clarity, and professional tone
Custom Rules
Create custom rules to enforce consistent wording and terminology across your writing
Pricing
Free
$0
- 10,000 characters per check
- Basic grammar and spelling
- 30+ languages
- Browser extension
Premium
$4.99/month
Best For
Multilingual Business Communication
Check emails, reports, and documents in multiple languages for international teams and businesses
Academic and Research Writing
Polish academic papers, dissertations, and research articles with advanced grammar and style suggestions
Content Creation & Blogging
Ensure blog posts, articles, and marketing copy are error-free and professionally written
Non-Native Language Writing
Get extra support writing in a second language with language-specific grammar rules and suggestions
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