Swift is a general-purpose programming language used to develop superior-quality native apps specifically for iOS.
it is now a general-purpose programming language still compatible with Mac OS and iOS and was the primary iOS coding language before Swift came around.
Flutter allows the developers to create aesthetically attractive and intuitive cross-platform apps, that is why it is considered by both android and iOS developers.
It was introduced by Microsoft in 2000 as a standing competitor of Java. It’s an object-oriented programming language that is integrated with the .Net framework.
React Native is a cross-platform framework introduced in 2015 by Facebook. Today it is one of the most popular cross-platform tools.