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LanguageTool

Open-source grammar checking, including self-hosted.

Visit LanguageTool Freemium

LanguageTool checks grammar and style across more than 25 languages, which is broader coverage than most competitors. The core is open source and can be self-hosted, which matters for anyone who cannot send text to a third party. It integrates with browsers, office suites, and editors. The free tier covers basic checking with a length limit.

Where it falls short

Suggestions are sometimes pedantic, and the self-hosted version requires more setup than most people want.

Alternatives in Writing & Content

  • Grammarly
    Proofreading that catches more than a spellchecker.
  • Hemingway Editor
    Highlights the sentences that are hard to read.
  • QuillBot
    Paraphrasing tool for rewording, with a useful grammar check.

Guides that cover LanguageTool