Grammarly vs LanguageTool
Which tool to choose in 2026?
Texte📊 Comparison radar
Grammarly
LanguageTool
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📋 General information
Grammarly
Rating
★★★★☆ 4.3/5
Pricing
Freemium
Price detail
Free (basic corrections + 100 AI prompts) · Pro: $12/mo · Enterprise: custom pricing
Company
Grammarly
Launched
2009
Platforms
web, ios, android, api
LanguageTool
Rating
★★★★☆ 3.9/5
Pricing
Freemium
Price detail
Free (10,000 char./check) · Premium: $4.99/mo · Teams: $9.48/mo (2 users)
Company
LanguageTooler GmbH (Learneo)
Launched
2003
Platforms
web, ios, android, api
✨ Features
| Feature | Grammarly | LanguageTool |
|---|---|---|
| Advanced AI grammar correction | ✅ | — |
| GrammarlyGO: AI generation/rewriting | ✅ | — |
| Plagiarism detection (16B+ pages) | ✅ | — |
| Enterprise Brand Voice | ✅ | — |
| Browser extension (500K+ sites) | ✅ | — |
| Full Office integration | ✅ | — |
| 31 supported languages | — | ✅ |
| Open-source core (LGPL 2.1) | — | ✅ |
| AI rewriting (via OpenAI) | — | ✅ |
| 10,000 char. free per check | — | ✅ |
| Browser extension (Chrome, Firefox, Edge, Safari) | — | ✅ |
| Self-hostable (Docker/Java) | — | ✅ |
⚖️ Pros & Cons
📗 Grammarly
- exceptional multi-platform coverage: works across 500,000+ apps and websites
- The most complete security certification stack in the category, including responsible AI and health data
- Industry standard: tens of millions of daily users and adopted by virtually all major enterprises
- Generous free plan with unlimited grammar corrections — rare in this category
- Option to opt out of AI training on your data, available to all users
- No EU hosting — all data goes through American servers
- No public API for developers — impossible to integrate Grammarly into your own tools
- French remains a second-class citizen: the tool excels in English but other languages lag behind
✅ LanguageTool
- The only grammar checker with an open-source core: you can self-host it on your own servers
- 31 languages supported — the broadest multilingual support among grammar checkers on the market
- Half the price of Grammarly (~$5/mo vs ~$12/mo) for comparable features
- GDPR compliant with texts not stored — privacy by default
- Native integrations with LibreOffice, Word, Google Docs and VS Code
- Acquisition by a US company transferred data control to California — contradicts the EU open-source image
- AI rewriting sends your texts to a third-party provider — caution with sensitive content
- No built-in plagiarism detection — you will need a complementary tool
🏆 Verdict
📗 Choose Grammarly
The global standard for AI correction with an impressive security stack (6 ISO certifications), but the lack of EU hosting and public API are notable gaps.
✅ Choose LanguageTool
The best value multilingual grammar checker with the unique advantage of self-hosting, but the US acquisition tarnishes the EU privacy narrative.
Grammarly
LanguageTool