What are some alternatives?
When comparing appenguin and Website 2 APK Builder, you can also consider the following products
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
GoNative.io - Convert your existing web application into native Android and iOS
AppPresser - Build iOS/Android apps using WordPress with AppPresser.
MIT App Inventor - MIT App Inventor | Explore MIT App Inventor
Codefreebnb - Airbnb clone. Written with not one line of code