We are currently beta testing Grammarly for Chrome in Google Docs.
We’ll be rolling out the beta gradually, so it may take time for some users to get access. For now, it’s only available on Google Chrome. However, you can upload and check your documents in the online Grammarly Editor. Also at your disposal: Grammarly for Microsoft Office (available for Windows OS), the Grammarly extension for your preferred browser (Chrome, Safari, Firefox, and Edge), and the desktop app.