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
Bubble - Don't hire engineers! Bubble let's you build an app entirely visually
Website 2 APK Builder - Convert your HTML, CSS, JS and all other web content into an Android App within seconds.
Kodular - Much more than a modern app creator without coding