Oh the irony that this is the wrong forum to ask that question.
See Item 2 of the Posting Guidelines
Quote:
Have you searched or Googled for a solution?
E.g.
Google[
^] search for your specific question.
Interestingly, your
cross-post[
^] at another site also comes up in that search
Quote:
Your question is too broad, but have a look at things like Xamarin and ReactJS, both of which let you build a platform independent mobile app, and then deploy on both Android and iOS (and, in the case of Xamarin, also to Windows phones). – Tim Biegeleisen 26 mins ago