What are some alternatives?
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
GoNative.io - Convert your existing web application into native Android and iOS
MIT App Inventor - MIT App Inventor | Explore MIT App Inventor
appenguin - Turn the most complex web application or website to into an Android app in minutes, for free!
Bubble - Don't hire engineers! Bubble let's you build an app entirely visually