Grammar makes perfect, but perfect grammar makes you a sophisticated philosopher of the world. We all use small hints in everyday work, where Grammarly won its blue ocean Bay.
In we try to roll the thread, the cofounder is not native (anglophone), because natives "need no grammar checker", but still he got his education in western university. This service deserves a close look, and it will definitely help students, office workers, and media users. The more we print instead of writing with ink on paper, the more we will be addicted to such helper in the right corner of the browser.
Even at this moment, this tech app is helping me to be clear in thoughts, and build bridges between other people.