LanguageTool

LanguageTool is a free and open-source grammar checker, and all its features are available for download.[4] LanguageTool website connects to a proprietary sister project LanguageTool Plus, which provides improved error detection for English and German, as well as easier revision of longer texts, following the open-core model.

LanguageTool
LanguageTool WikiCheck
Developer(s)Daniel Naber and Marcin Miłkowski
Initial release15 August 2005 (2005-08-15)
Stable release5.0 (27 June 2020 (2020-06-27)) [±][1]
Repository
Written inJava
PlatformJava SE
Size
  • Desktop app: 156 MB[2]
  • n-gram data: 8.34 GB[3]
TypeGrammar checker
LicenseGNU LGPL v2.1+
Websitelanguagetool.org 

It was started by Daniel Naber for his diploma thesis[5] in 2003 (then written in Python). It now supports 31 languages, each developed by volunteer maintainers, usually native speakers of each language.[6] Based on error detection patterns, rules are created and then tested for a given text.

The core app itself is free and open-source, and can be downloaded for offline use. Some languages use 'n-gram' data,[7] which is massive and requires considerable processing power and I/O speed, for some extra detections. As such, LanguageTool is also offered as a web service that does the processing of 'n-grams' data on the server side. LanguageTool Plus also uses n-grams as part of its freemium business model.

LanguageTool web service can be used via a web interface in a web browser, or via a specialized client-side plug-ins for Microsoft Office,[8] LibreOffice,[9] Apache OpenOffice,[10] Vim,[11][12] Emacs,[13][14] Firefox,[15] Thunderbird,[16] and Google Chrome.[17] Its web app client can also be integrated on websites.[18]

See also

References
  1. "LanguageTool Change Log". languagetool.org. 27 June 2020.
  2. "Index of /download/". languagetool.org.
  3. "Index of /download/ngram-data/". languagetool.org.
  4. "LanguageTool - Spell and Grammar Checker". LanguageTool.
  5. Daniel Naber. "A Rule-Based Style and Grammar Checker" (PDF). Danielnaber.de. Retrieved 30 June 2018.
  6. "Supported languages". 28 December 2016. Retrieved 29 December 2016.
  7. "N-Gram Data Download Page". languagetool.org. 2019-03-30. Retrieved 2019-03-30.
  8. "LanguageTool Microsoft Office Plug-in". 11 January 2019. Retrieved 29 December 2016.
  9. "LanguageTool v4.4" (OXT). Languagetool.org. Retrieved 11 January 2019.
  10. "LanguageTool v2.5" (OXT). Languagetool.org. Retrieved 30 June 2018.
  11. "LanguageTool – Grammar checker for English, French, German (etc.) in Vim : vim online". Vim.org. Retrieved 2014-05-03.
  12. "vim-grammarous: A powerful grammar checker for Vim using LanguageTool". GitHub. Retrieved 2014-09-30.
  13. Schroeder, Alex (2013-08-24). "langtool.el". EmacsWiki. Retrieved 2014-05-03.
  14. Hayashi, Masahiro. "Emacs-langtool". GitHub. Retrieved 2019-03-18.
  15. "Grammar and Spell Checker - LanguageTool". addons.mozilla.org. Mozilla Foundation. 2018-12-26. Retrieved 2019-01-05.
  16. "Grammar Checker". addons.mozilla.org. Mozilla Corporation. 2013-05-17. Retrieved 2014-05-03.
  17. "LanguageTool - Grammar and Style Checker". Google Chrome Webstore. 2017-12-17. Retrieved 2017-12-29.
  18. "Integration On Websites – LanguageTool Wiki". Wiki.languagetool.org. 2014-04-15. Retrieved 2014-05-03.
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