Сreation of a web application

I want to create applications for my website so that people can download it from marketplaces. I used to make similar applications using app geyser. It is convenient that the program itself makes the application, you just need to load the url of the site. But the app geyser has limited functionality even in the paid version.

Is the application created in a mit app in a similar way or does it need to be developed from scratch? I would like not to bother too much with the creation, but just get a ready-made application and modify what I do not like.

No, AI2 is here to teach the basics of coding and computational thinking.
What few templates it has are for classroom exercises.

Thank you, I will decide how best to create an application for my website