These are the languages that you must know (more or less) in order to create modern apps that run in all the mobile and desktop browsers, as well platforms like Android, iOS and Microsoft Windows. The DecSoft App Builder apps are based in HTML, CSS and javascript.
If you want to create modern desktop and mobile apps you're in the right place! DecSoft App Builder is a professional visual development environment to create HTML5 apps, WebApps, Progressive WebApps, Web Extensions and Hybrid apps for the modern mobile and desktop browsers, as well platforms like Google Android, Apple iOS and Microsoft Windows.