Ubuntu app platform for running apps on a shared platform of libraries
Ubuntu app platform is an optional package your app can use to minimize the disk space the app takes. The platform offers you shared content which includes Qt 5.6.2 with Ubuntu's backported fixes, Ubuntu UI Toolkit, PIM libraries and Oxide web browser engine among else.
It is recommended to use the associated cloud part desktop-ubuntu-app-platform to make the usage easy. Note that for developing a package targeting to use ubuntu-app-platform, you will need to use Ubuntu 16.04 LTS added with the "stable-phone-overlay" PPA which includes the newer Qt and other packages!