LanguageTool’s Premium languages are:
English
Dutch
French
German
Spanish
Portuguese
LanguageTool also supports:
Arabic
Asturian
Belarusian
Breton
Catalan
Chinese
Danish
Dutch
Esperanto
French
Galician
Greek
Irish
Italian
Japanese
Khmer
Norwegian
Persian
Polish
Romanian
Russian
Slovak
Slovenian
Swedish
Tagalog
Tamil
Ukrainian
It’s worth noting that LanguageTool also supports different dialects of several languages.
English: Australia, British, Canada, New Zealand, South Africa, US
German: Austria, Germany, Switzerland
Portuguese: Angola, Brazil, Mozambique, Portugal
👉 Here you can find more information about the languages supported by LanguageTool.