LanguageTool is a style and grammar checker that currently supports English, Polish, German, French, Dutch, and other languages to a different degree. It scans the words and their part-of-speech tags for occurrences of error patterns, which are defined in an XML file. More powerful error rules can be written in Java. LanguageTool should be used after the spelling of a text has been corrected.
| Tags | grammar language Writing proofreading |
|---|---|
| Licenses | LGPL |
| Implementation | Java XML |
Recent releases


Release Notes: This release adds many updates for the error detection rules for English, French, German, Portuguese, Catalan, Polish, Russian, Breton, Esperanto, and Italian. LanguageTool is now modular, for easier use by Java developers. Instead of one big JAR, there are now several small ones (soon to be found at Maven Central). Several bugs have been fixed.


Release Notes: Many updates for the error detection rules for English, Spanish, French, German, Portuguese, Russian, Breton, Catalan, Esperanto, and Ukrainian have been added. The embedded HTTP server can now be started from the context menu if LanguageTool is running in the system tray. Some small bugs have been fixed.


Release Notes: Many new error detection rules have been added and existing rules have been updated. Mostly affected languages are Danish, German, English, Catalan, Russian, Chinese, French, Breton, Portuguese, and Esperanto. There is initial support for Japanese, with about 20 rules. Several bugs have been fixed.


Release Notes: Spell checking is now included in the LanguageTool stand-alone version (i.e. not used in LibreOffice/OpenOffice). Many error detection rules have been improved and new rules have been added, especially for German, English, Catalan, Italian, French, Breton, Polish, and Esperanto. Initial support for Greek and Portuguese with a few rules has been added. LanguageTool now supports language variants like British English, American English, Swiss German, etc. Several bugs have been fixed.


Release Notes: The release contains error detection rule updates for several languages, affecting French, English, Breton, Russian, Esperanto, and German. Also, several small bugs have been fixed.