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LanguageTool

Open-source grammar, style and spell checker

★ Stars15.2k15,159 on GitHub
Last commit18 Oct 2026
LicenceLGPL-2.1SPDX, from the repository
View on GitHub ↗

From GitHub, fetched 19 Oct 2026.

Visit languagetool.org ↗

LanguageTool checks grammar, style and spelling in more than 30 languages. The core engine is open source and can run locally; the hosted service has a free tier and a paid Premium plan.

Who it suits

  • Students and writers: LanguageTool's site mentions “working on a dissertation, essay, book, or you just want to note something down.”

From languagetool.org, checked 19 Oct 2026. Quotes are the project's own words.

Free alternative to

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