React Native and Flutter, albeit being the two similar facets of cross-platform app development, are always hailed as staunch rivals. Both help developers lessen the Time to Market (TTM) in shipping interactive business applications to clients and thereby improve productivity.

i) React Native :
React Native is a popular open-source framework that runs on JavaScript. It primarily focuses on the native rendering of applications that is majorly compatible with Android and iOS. React Native is written with the combination of XML -Esque markup and JavaScript which is also known as JSX. It is backed by the social media giant Facebook, with over 50 dedicated engineers working on the framework at present.

• Uses :
Simple cross-platform apps
• Quick prototype applications
• Apps with simplified UI
• Apps that look nearly native with responsive UX using FlexBox
• Apps with reusable components
• Apps that operate with synchronous APIs

React Native - Wikipedia

Popular apps that are made with React Native are:
• Facebook – Developed a supercharged, supportive mobile UI with simple navigation.
• Walmart – Improved user experience by building smooth in-app animations identical to native functionality.
• Bloomberg – Streamlined simple-to-access, personalized content for users with automatic code refreshing features.
• Instagram – Implemented push notification in the form of WebView without building navigation infrastructure.
• SoundCloud – Bridged the time gap between updates and patched versions simultaneously for iOS and Android.
• Wix – Achieved high speed and agility in the development of configurable navigations and screen options

ii) Flutter:
Flutter is an open-source framework that functions with a language called Dart created by Google. It is commonly addressed as an enhanced UI toolkit that’s used to build cross-platform applications with a single codebase. It provides accessibility to develop expressive and flexible UI with native performance. Additionally, it is supported and contributed by a team of Google developers and the entire flutter community.

• MVP mobile applications
• Apps with material design
• Apps that function with OS-level features
• Advanced OS plugins with simple logic
• High-performance apps with Skia rendering engine
• Flexible UI with high-level widgets
• Reactivate apps with vast data integration

Flutter – Medium

Popular apps that are made with Flutter are:
• Google Ads – Leveraged Dart packages, Firebase AdMob plugins, and static utility classes of Flutter to provide a portable user experience in iOS and Android.
• Tencent – Built a connected and shared device experience between users with multi-platform support with fewer than 5 developers.
• Alibaba – Created a single-tap navigation experience for all applications with high FPS and a single codebase.
• eBay – Leveraged complex and customized edge-powered AI features by integrating Flutter and Firebase to create autoML for eBay Motors.
• BMW – Developed high-performance user interfaces by using flutter_bloc for management.
• Reflectly – Migrated from React Native to Flutter and created quality data events with the StreamBuilder widget to improve data synchronization.

React Native has a lower performance compared to Flutter. This is because of the JavaScript bridge that’s used to communicate between native modules. For each interval, the number of frames that got dropped in a React Native’s “hello world” app is much higher than Flutter. In some cases, the application took longer than 16 milliseconds to render program making the application stutter. You can improve your app’s performance by using third-party libraries like Proguard that further optimizes bytecodes. Also, elements like Slowlog help setting performance timers that can help to track performance issues and to resolve them

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