When you make a cross-platform application with Flutter, it becomes a Flutter app, not a platform-specific native app . Flutter apps come with different UI specifications and give different user experiences for end-users.
Read moreWill Flutter replace native iOS?
Even in the case of iOS applications, there is a huge amount of applications and libraries constantly developed already written in Swift. It is very unlikely that they will be abandoned and re-written using Flutter. Flutter has no Apple’s support . In many cases creating native iOS applications is just necessary.
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