When it comes to learning curve and approachability, Swift has an edge over Flutter because, as mentioned previously, you don’t need to learn a new programming language to build native iOS apps. That said, thanks to their rich documentation and community support, both Flutter and Swift are relatively easy to learn.
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For Android Application Development, you have to learn Java/Kotlin to develop an application on Android. You can learn some of the frameworks like React Native, Flutter, Ionic,Phonegap etc to develop a normal application in Android also. Flutter is definitely a good option to make apps for Android and iOS.
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