Free & Open-Source Grammarly Pro Alternatives

AI grammar checking premium.

1. LanguageTool ↗ FOSSPRIVATESELF-HOST
   Multi-language grammar + style checker.
   ●○○Easy · Strong feature parity
2. Harper ↗ FOSSPRIVATE
   Fast offline English grammar checker.
   ●○○Easy · Strong feature parity
3. Writer ↗ FOSSPRIVATE
   FocusWriter — distraction-free writing app.
   ●○○Easy · Strong feature parity