What is a Marzipan app?

[DelJo63]

Marzipan is an internal code name for a project that aims to adds new developer tools that will enable developers to design and engineer a single application that runs on iPhone, iPad, and Mac. ... Mojave included apps like Apple News, Voice Memos, Stocks, and the Home app.

This is much like what Windows 10 was intended to do; allow Apps built for the Windows Phone to run on the desktop.

Time will tell if Cupertino will succeed where Redmand failed

 

[JackHouston]

It has been uninstalled from my computer,it doesn't work for me anyway.