With GTask for Desktop you can manage your Google tasks from your desktop or notebook computer. It supports all features from Google tasks including hierarchical tasks. The application can be used offline with a customizable synchronization interval. You can manage the task lists of multiple Google accounts from an intuitive nice looking user interface.
GTask for Desktop is not wrapping the Google web page nor is it a Chrome browser extension. It's a full featured desktop application with all advantages you would expect from such application.