What are some alternatives?
When comparing Thunkable and appenguin, you can also consider the following products
Codefreebnb - Airbnb clone. Written with not one line of code
GoNative.io - Convert your existing web application into native Android and iOS
MIT App Inventor - MIT App Inventor | Explore MIT App Inventor
Android Studio - Android development environment based on IntelliJ IDEA
Website 2 APK Builder - Convert your HTML, CSS, JS and all other web content into an Android App within seconds.
Bizness Apps - Create your own app or become a reseller and build apps for others