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JUniversal
JUniversal

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React Native Seed
React Native Seed

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JUniversal vs React Native Seed: What are the differences?

JUniversal: A new, Java-based approach to cross-platform mobile apps (used by Google Inbox and Google Spreadsheets). The vision of JUniversal came from some guys at Nokia who possess considerable expertise both in Java and in building cross-platform apps. They built this tool to provide an elegant way to translate source code and make it useful across multiple platforms. JUniversal offers you the freedom to write your shared code in Java and then translate it to C# (available now) or to C++/Objective C++ (coming soon). You can also combine JUniversal with Google’s j2objc translator to translate Java to Objective-C for iOS; React Native Seed: Get your favorite boilerplate of React Native. ReactNativeSeed.com provides you with a number of React Native Boilerplates to choose from. You can opt for MobX or Redux for state-management, TypeScript or Flow for static type checking and CRNA or plain React Native for the stack.

JUniversal and React Native Seed can be categorized as "Cross-Platform Mobile Development" tools.

JUniversal and React Native Seed are both open source tools. React Native Seed with 577 GitHub stars and 8 forks on GitHub appears to be more popular than JUniversal with 132 GitHub stars and 22 GitHub forks.

What is JUniversal?

The vision of JUniversal came from some guys at Nokia who possess considerable expertise both in Java and in building cross-platform apps. They built this tool to provide an elegant way to translate source code and make it useful across multiple platforms. JUniversal offers you the freedom to write your shared code in Java and then translate it to C# (available now) or to C++/Objective C++ (coming soon). You can also combine JUniversal with Google’s j2objc translator to translate Java to Objective-C for iOS.

What is React Native Seed?

ReactNativeSeed.com provides you with a number of React Native Boilerplates to choose from. You can opt for MobX or Redux for state-management, TypeScript or Flow for static type checking and CRNA or plain React Native for the stack.
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          What tools integrate with JUniversal?
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          What are some alternatives to JUniversal and React Native Seed?
          React Native
          React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native.
          Ionic
          Free and open source, Ionic offers a library of mobile and desktop-optimized HTML, CSS and JS components for building highly interactive apps. Use with Angular, React, Vue, or plain JavaScript.
          Xamarin
          Xamarin’s Mono-based products enable .NET developers to use their existing code, libraries and tools (including Visual Studio*), as well as skills in .NET and the C# programming language, to create mobile applications for the industry’s most widely-used mobile devices, including Android-based smartphones and tablets, iPhone, iPad and iPod Touch.
          Apache Cordova
          Apache Cordova is a set of device APIs that allow a mobile app developer to access native device function such as the camera or accelerometer from JavaScript. Combined with a UI framework such as jQuery Mobile or Dojo Mobile or Sencha Touch, this allows a smartphone app to be developed with just HTML, CSS, and JavaScript.
          Flutter
          Flutter is a mobile app SDK to help developers and designers build modern mobile apps for iOS and Android.
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          Avatar of Google
          Google uses JUniversalJUniversal

          Comment from HackerNews (https://news.ycombinator.com/item?id=8998736)

          This is how Google Inbox and Google Spreadsheets works. See the slides from my recently produced GWT Create Session (http://t.co/ZvoaHxCoZT). J2ObjC slide deck here (https://docs.google.com/presentation/d/1mW_Plm5jAygELf7qjVK7...) Videos of the conference will be online soon.

          Prior to that, some 20% Googlers also produced the PlayN library (https://github.com/threerings/playn) This was taken over by Michael Bayne who added an iOS backend by Bytecode -> IKVM -> Mono conversion. I beleive j2objc and RoboVM backends exist now as well.

          The major benefit of the j2objc approach is the avoidance of GC in favor of ARC, the conversion of message-sends into C-method calls when possible, and integration with existing iOS toolchain.

          When we started, it seemed like an iffy idea, but after developing a product delivered to millions of users on a high volume site (gmail) that has 70% code sharing, and being able to simultaneously develop, test, and deploy across the platforms reasonably efficiently, a lot of skeptics have become converts to the concept.

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