LanguageTool

What it does

LanguageTool checks grammar and style in more than 30 languages, including the European languages export correspondence actually uses. Open-source roots mean a self-hostable version exists.

Browser, Office and editor integrations are complete. The free tier covers basics; Premium adds style suggestions and higher limits.

Standout features

• 30+ language support
• Self-hostable open-source core
• Browser and Office integrations
• Team style guides on paid plans

Best for