title: Flutter: Use same app in web ,android and ios
body: <p>How do I build the flutter app that can be built for web and the same application be used on our existing android/ios apps.</p>
  
  <p>We already do have existing apps, we are looking to move towards flutter. Can we build a piece of our app in flutter, plug it into existing apps and use the same app in web too?</p>
  
  <p>Abhi</p>