How can i change a code to a real app

Question

App

Answer 1

Actually you can make some common apps using web languages.
/For Android
✓✓Sketchware

/For browser
✓✓ww.thunkable.com

Answer 2

You can use Swift for iOS and C# or C++for game developing

Answer 3

Html is used for blog writing and web work and cannot be used for making an app. The codes output will be in a web page of made by html

Answer 4

If you know JavaScript then you can write an app using node.js..
These languages will help👇
-Java
-C#
-C/C++
-Swift
-Kotlin
-Python
-Ruby

Answer 5

If it is not open source, if you don't dissassemble it there is little to be done.