As it turns out, no one else cared about the grey bar. They were too busy being amazed that the app actually worked [1, 2]. of Google Apps Script or see the workarounds for creating a custom UI without the banner?
: Host a simple HTML file on a service like GitHub Pages and use an iframe to display your script. As it turns out, no one else cared about the grey bar
If you are hosting the script as a Web App, you can embed it into your own professional website using an iframe. This doesn't technically delete the code from the script's source, but it places the application within your own branded environment. As it turns out