Which designer to choose to create an application?

Question

Android

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Answer 1

There are no such. More precisely, there are but the results are not impressive.
Try to study for example https://metanit.com/sharp/xamarin/1.1.php
In a month you will make an application, well, or order it, is also an option.

Answer 2

Thunkable, you can create simple applications and work with Firebase. True, without a subscription there will be a watermark. Instead of programming code from blocks
For more functionality, you can use ThunkableX