Comparison of LanguageTool Editions LT for Firefox LT for Chrome LT for Google Docs LT for LibreOffice / OpenOffice LT stand-alone
Min. Requirements any recent browser Firefox 48 current Chrome Google Docs LibreOffice / OpenOffice 4.0 + Java 8 Java 8
Works offline no
text sent to
over encrypted connection
no text sent over the internet
Automatically uses latest error detection rules yes no
Additional homophone rules for English, German, Spanish, French yes
only when installed manually

Looking for more software that integrates LanguageTool? See this list.