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LanguageTool

Open-source grammar checker supporting 30+ languages

LanguageTool is a free, community-driven grammar and style checker supporting multiple languages. It detects errors missed by other tools and offers premium features for advanced checking, including AI-powered suggestions.

Pricing fromFree (Premium $10/month)
Best forMulti-language users, developers, and privacy-conscious writers seeking open-source solutions
Websitelanguagetool.org

Strengths and trade-offs

  • Completely free tier covers comprehensive grammar and style checking in 30+ languages
  • Privacy-focused with no tracking; source code is fully transparent and open
  • Fewer integrations with popular platforms compared to proprietary tools
  • Premium features are less advanced than Grammarly's AI-driven suggestions

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