LanguageTool
Open-source grammar and style checker supporting 30+ languages
WritingFree
About LanguageTool
LanguageTool is an open-source grammar, style, and spell checker that supports over 30 languages — far more than Grammarly's English-only focus. The free plan catches grammar and spelling errors with browser extensions, desktop apps, and integrations for Google Docs, LibreOffice, and more. While the free tier has a character limit per check (20,000 characters), it detects more nuanced errors than most free alternatives. The premium plan adds style suggestions, word choice improvements, and longer text support.
Key Features
- ✓30+ language support (English, Spanish, German, French, etc.)
- ✓Browser extensions for Chrome, Firefox, Safari, and Edge
- ✓Google Docs and LibreOffice integration
- ✓Grammar, spelling, and punctuation correction
- ✓Personal dictionary for custom words
- ✓Open-source with self-hosting option
Use Cases
- •Multilingual writers who need grammar checking in multiple languages
- •Privacy-conscious users who want open-source alternatives to Grammarly
- •Academic writing with style and tone suggestions
- •Teams working in non-English languages