Rated according to our test methodology.
Grammarly vs. LanguageTool 2026: Which AI writing tool is better for German texts? A comparison of grammar, privacy, and price.
Grammarly and LanguageTool are the best-known AI-powered writing assistants for grammar, style, and spelling. While Grammarly leads globally, LanguageTool offers significant advantages — especially for German speakers. This review shows which tool is better suited for your writing.
Grammarly vs. LanguageTool: Direct Comparison
Criterion
Grammarly
LanguageTool
English support
Very strong
Strong
German support
Moderate
Very strong
Multilingual
Limited
100+ languages
Free version
Yes (limited)
Yes (limited)
Premium
€12/month
€10/month
AI rewriting
Yes (GrammarlyGO)
Yes
Privacy
USA
Germany (EU-compliant)
Self-hosting
No
Yes (open source)
Our verdict (DE)
★★★
★★★★½
Grammarly: The Global Market Leader
With over 30 million daily active users, Grammarly is the most widely used AI writing tool in the world. The browser extension, desktop app, and integrations with Google Docs, Microsoft Word, and Slack make it an ever-present writing companion.
GrammarlyGO — the AI writing feature — can rewrite texts at the click of a button, adjust tone, and generate content. For English-speaking users, Grammarly is nearly unmatched in quality and ease of use.
Grammarly's Strengths
- World-class English grammar and style correction
- Broad integration: browser, Docs, Word, Outlook, Slack
- GrammarlyGO for AI text generation and rewriting
- Excellent tone detection (formal, friendly, concise)
- Plagiarism detection (Premium/Business)
- Intuitive user interface
Grammarly's Weaknesses
- Significantly weaker for German than LanguageTool
- Privacy: US servers, not GDPR-first
- No self-hosting option
- More expensive than LanguageTool for comparable features
LanguageTool: The European Alternative
LanguageTool was developed in Germany in 2003 and is now one of the most powerful grammar tools for over 100 languages. It is particularly strong in its support for German, French, Spanish, and other European languages. LanguageTool recognizes complex grammar rules that Grammarly often misses in German.
Privacy is a genuine differentiator: as a European company, LanguageTool is GDPR-compliant, and the open-source version allows self-hosting — important for organizations handling sensitive data.
LanguageTool's Strengths
- Excellent German grammar (case, gender, sentence structure)
- 100+ languages including Swiss German and Austrian German
- GDPR-compliant, European data protection
- Open-source version for self-hosting
- Cheaper than Grammarly (€10/month)
- Team features for businesses
LanguageTool's Weaknesses
- English correction weaker than Grammarly
- AI text generation less mature
- Interface less polished than Grammarly
- Smaller integration ecosystem
Verdict: Grammarly vs. LanguageTool
For German-speaking users, LanguageTool is the clear recommendation: it understands the nuances of German grammar better, is cheaper, and is GDPR-compliant. For English-language content, Grammarly is nearly unbeatable. Many professionals use both tools: Grammarly for English emails, LanguageTool for German texts.
Frequently Asked Questions (FAQ)
Is Grammarly or LanguageTool better for German?
LanguageTool has significantly stronger support for the German language and detects complex grammatical errors in German more reliably. Grammarly is primarily optimized for English.
Which tool is cheaper?
LanguageTool Premium is cheaper than Grammarly Premium and also offers a self-hosting option. Both have free versions with limited features.
Does Grammarly work in German?
Grammarly supports German, but is primarily optimized for English. For German texts, we recommend LanguageTool or the language checker built into Microsoft Word.
Can I self-host LanguageTool?
Yes, LanguageTool offers an open-source version for self-hosting. This is particularly relevant for organizations with strict data protection requirements (GDPR).
