JUniversal
JUniversal

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Xamarin
Xamarin

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699
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JUniversal vs Xamarin: What are the differences?

Developers describe JUniversal as "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. On the other hand, Xamarin is detailed as "Create iOS, Android and Mac apps in C#". 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.

JUniversal and Xamarin belong to "Cross-Platform Mobile Development" category of the tech stack.

Some of the features offered by JUniversal are:

  • OAuth (based on Scribe)
  • JSON
  • Unit testing (JUnit)

On the other hand, Xamarin provides the following key features:

  • Cross-platform development- Thinking about supporting iOS, Android, Mac and Windows? Xamarin allows you to write it all in C#.
  • Reuse existing code- Use your favorite .NET libraries in Xamarin apps. Easily use third-party native libraries and frameworks.
  • Discover as you type- Explore APIs as you type with code autocompletion.

JUniversal is an open source tool with 132 GitHub stars and 22 GitHub forks. Here's a link to JUniversal's open source repository on GitHub.

- No public GitHub repository available -

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 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.

Want advice about which of these to choose?Ask the StackShare community!

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      What are some alternatives to JUniversal and Xamarin?
      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.
      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.
      PhoneGap
      PhoneGap is a web platform that exposes native mobile device apis and data to JavaScript. PhoneGap is a distribution of Apache Cordova. PhoneGap allows you to use standard web technologies such as HTML5, CSS3, and JavaScript for cross-platform development, avoiding each mobile platforms' native development language. Applications execute within wrappers targeted to each platform, and rely on standards-compliant API bindings to access each device's sensors, data, and network status.
      Flutter
      Flutter is a mobile app SDK to help developers and designers build modern mobile apps for iOS and Android.
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      Decisions about JUniversal and Xamarin
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      Interest over time
      Reviews of JUniversal and Xamarin
      Review ofXamarinXamarin

      I'm working in Huge company and I'm in charge to choose the cross-platform environment to develop Mobile application for all our services. I choose Xamarin but because the error i get everytime in Visual Studio, I want to leave it and recommand another solution. In fact that's why I'm here.

      Weird, Install VS2017 with Xamarin on a new PC Create a new app GOT ERRORS.....!!!!!

      Thank you for considering this

      How developers use JUniversal and Xamarin
      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.

      Avatar of Foundbite
      Foundbite uses XamarinXamarin

      Xamarin enables us to develop for 3 platforms (iOS, Android and Windows Phone) with one core codebase coded in C#. Xamarin has allowed us to release an app on all three platforms and develop them simultaneously - not bad for a team of 2!

      Avatar of Ana Phi Sancho
      Ana Phi Sancho uses XamarinXamarin

      Self taught : acquired knowledge or skill on one's own initiative. Platform: OSX 10.8 or later. Mac computer user.

      Avatar of Robert Brown
      Robert Brown uses XamarinXamarin

      Build & ship OS X & iOS apps from Visual Studio on Windows. Requires paid team license.

      Avatar of Daniel Kovacs
      Daniel Kovacs uses XamarinXamarin

      Mobile app development with PCL and Xamarin.iOS and Xamarin.Android.

      Avatar of Olo
      Olo uses XamarinXamarin

      Cross platform, white labelled native mobile apps

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