What are some alternatives?
When comparing AppyBuilder and Kodular, you can also consider the following products
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
MIT App Inventor - MIT App Inventor | Explore MIT App Inventor
Bubble - Don't hire engineers! Bubble let's you build an app entirely visually
AppsGeyser - Appsgeyser is the easiest to use DIY native mobile app creation platform.
appenguin - Turn the most complex web application or website to into an Android app in minutes, for free!
Android Studio - Android development environment based on IntelliJ IDEA