I run course for video game development for 60K students from all over the world who are non-native English speakers. Upcopy is a solution that helps my students to check not just grammar but to see the tone of voice and emotions to see how they are embedded in the written text such as their essays as a part of the studies. I think this would be great tool to build strong and consistent brand image while communicating with customers. It goes beyond the language errors, and offers the emotions, tone and consistent voice checks.