LanguageTool
Open-source AI grammar checker supporting 30+ languages including German, French, Spanish
What is LanguageTool?
LanguageTool is the open-source grammar checker that does what Grammarly does not: support non-English writing at a professional level. While Grammarly handles English and a handful of other languages at a basic level, LanguageTool provides deep grammar checking for 30+ languages including German, French, Spanish, Portuguese, Italian, Dutch, Polish, and more. For European professionals writing in their native language, LanguageTool is the clear choice.
The tool checks grammar, style, and spelling with rules developed by a community of linguists and language experts. The AI-powered suggestions go beyond simple rule matching to understand context — correctly identifying whether a word is a noun or verb in context-dependent situations that trip up simpler grammar tools.
At $5.83/mo (billed annually), LanguageTool Premium is the most affordable premium grammar checker available. The free plan covers 20 corrections per text piece and is sufficient for casual use. For multilingual organizations or non-English content teams, the Team plans offer centralized management at competitive pricing.
Key Features
- Grammar and style checking in 30+ languages
- Real-time corrections as you type
- Browser extension (Chrome, Firefox, Edge, Safari)
- Microsoft Word and Google Docs add-ins
- LibreOffice add-in
- AI-powered paraphrasing suggestions
- Picky Mode (advanced style suggestions)
- Custom dictionary and rules
- Team management (Premium)
- API access for developers
Pros & Cons
Pros
- Best multilingual grammar checking — 30+ languages vs Grammarly's limited non-English support
- Open-source foundation ensures transparency and linguistic accuracy
- Most affordable premium grammar tool at $5.83/mo
- Works with LibreOffice — rare among AI writing tools
Cons
- English grammar checking is slightly weaker than Grammarly Premium
- Interface and UX less polished than Grammarly
- Free plan limits to 20 corrections per check
- AI rewrite suggestions are more basic than Grammarly or Wordtune
Pricing
Model: Subscription
| Plan | Price | Key Limits |
|---|---|---|
| Free | $0/mo | 20 corrections per text, basic grammar |
| Premium | $5.83/mo | Unlimited corrections, all languages, paraphrasing |
| Team | $5.83/user/mo | All Premium + team management, usage stats |