What are some alternatives?
When comparing MIT App Inventor and Kodular, you can also consider the following products
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Codefreebnb - Airbnb clone. Written with not one line of code
Android Studio - Android development environment based on IntelliJ IDEA
Dropsource - Mobile development platform for building native iOS & Android apps
AppsGeyser - Appsgeyser is the easiest to use DIY native mobile app creation platform.
App Press - App Press provides tools to create and publish apps for iOS and Android.