Does anyone have sources or links to examples of a mobile application (browser) that is used as a site mp?

Question

Android

Hello. I have already seen many different projects like mymobileapp.online. All that is done on them is going to a mobile application, which in essence is a browser that opens only 1 site. So I'm looking for the source of such an application, does anyone have such or a link on the site where they write about this