JUniversal vs Trigger.io: What are the differences?

What is 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.

What is Trigger.io? The simplest way to build amazing mobile apps using the best of HTML5 and native. You write your HTML5 code using the Forge JavaScript API which gives you access to native features such as the camera and contacts API.

JUniversal and Trigger.io can be categorized as "Cross-Platform Mobile Development" tools.

Some of the features offered by JUniversal are:

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

On the other hand, Trigger.io provides the following key features:

• Build native apps for iOS and Android using JavaScript
• Native UI, push, analytics, login modules "out-of-the box"
• Cloud build service, no need to setup Eclipse / Xcode

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.