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User Interface
React Native provides native components in Android as well as iOS, so the experience remains the same on both platforms.
The components, widgets, buttons, etc. are the same across platforms. When you update the OS UI, the app components can also be updated immediately. Flutter harbors a flexible, quick-rendering UI with its own design, including interactive widgets, platform, as well as visual designs. Flutter also makes use of pixel rendering to make sure that the UI is identical across all devices. React Native offers variety and versatility.
Programming Language
React Native uses JavaScript. According to Stack Overflow, over 70% of professional developers are familiar with JavaScript. When you move into using React, it is intuitive if you’ve previously used JavaScript. Flutter uses the programming language Dart, which is almost exclusive to Google. It does allow you to compile native code at a more rapid rate, but it means a steeper learning curve for anyone outside of Google.Time Required
Developers are always on a time crunch to finish their app projects with utmost quality standards. This means that they need React Native, due to its speedy development time. The framework is made to create a mobile app quickly. Flutter takes time as each section needs to be coded separately. React Native provides ready-made components which can be
placed, reused, and adjusted when needed.
Different Coding Styles
React Native owns a complex code structure, but the same code can be used throughout the web apps, iOS, Windows OS, Android, etc. This ensures that codes are shared with third-party libraries for reuse by all. Flutter however has simpler coding options. One can code all in one place and get access to it all. Templates, data, and styles are not separated. While this is simpler to use, code sharing can only be done between
Android and iOS. This is expected to change, but for now, Flutter is much more limited than React.