What are some alternatives?
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Bubble - Don't hire engineers! Bubble let's you build an app entirely visually
Android Studio - Android development environment based on IntelliJ IDEA
appenguin - Turn the most complex web application or website to into an Android app in minutes, for free!
AppsGeyser - Appsgeyser is the easiest to use DIY native mobile app creation platform.
AppMakr - AppMakr is a browser-based platform designed to make creating your own iPhone app quick and easy.