You can also add the parameter "-app" followed by the website URL in a chrome shortcut and it will open as an app.
What's a chrome shortcut?
a shortcut to chrome
I assume gp is referring to a Windows shortcut.
Or a "launcher" in order to launch it like a desktop native application.
I haven't tried most recent versions, but ~two months ago WhatsApp couldn't be "nativefied" (wanted it for Linux) because Nativefier's electron version was old and whatsapp was complaining, but I really love this project. :-)