LanguageTool
AI-powered grammar, style, and paraphrasing assistant for professional writers across 30+ languages.
- Data: Mixed
- GDPR-native
- EU-owned
- Self-hostable
- Open source
LanguageTool is an open-source, German-built AI writing assistant that detects grammar, spelling, punctuation, style, and word choice errors across 30+ languages. Founded in 2003 and supported by EU funding, it offers both free and premium tiers with cross-platform integration (browsers, office apps, email) and full self-hosting capability.
LanguageTool is an open-source, German-built AI writing assistant that detects grammar, spelling, punctuation, style, and word choice errors across 30+ languages. Founded in 2003 and supported by EU funding, it offers both free and premium tiers with cross-platform integration (browsers, office apps, email) and full self-hosting capability.
Highlights
- ✓Multilingual support covering 30+ languages and dialects with automatic detection
- ✓AI-powered paraphrasing and advanced style analysis beyond basic grammar checking
- ✓Open-source and self-hostable with full HTTP and Java API documentation
- ✓Cross-platform integration (browsers, Google Docs, Word, LibreOffice, email clients) with privacy-respecting browser extension that stores no text locally
- Data location
- Mixed
- Pricing
- Freemium
- EU-owned
- Yes
- Self-hostable
- Yes
Good for
- Professional enterprise communication across 150+ companies including BMW, EU institutions, and media outlets
- Academic writing for dissertations and research papers with multilingual dialect support
- Content teams creating in multiple languages who need consistent style and tone analysis
A European alternative to
Frequently asked questions
- Is LanguageTool EU-owned and GDPR-native?
- LanguageTool — European-owned: Yes; GDPR-native: Yes; self-hostable: Yes; data stored in: Mixed.
- How much does LanguageTool cost?
- Pricing model: Freemium. Check LanguageTool's own site for current plans and numbers.
- What are European alternatives to LanguageTool?
- Compare GDPR-native European alternatives to LanguageTool — where each one is built, owned and hosted.
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