LanguageTool

Freemium (Open Source)

An open-source grammar, style, and spell checker supporting over 30 languages, available as a browser extension, desktop app, and self-hosted service.

★ ★ ★ ★ ★ 4.0

About LanguageTool

Alternative to

Grammarly

Screenshots

LanguageTool grammar

Pros & Cons

Pros

  • Open source under LGPL — self-host for unlimited checks with complete privacy
  • Supports over 30 languages, far exceeding Grammarly's language coverage

Cons

  • AI-powered style and clarity suggestions require the paid Premium plan
  • Writing tone and engagement scoring is not as polished as Grammarly Premium

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