|Google Cardboard Assembled|
The first version of Cardboard could fit phones with screens up to 5.7 inches (140 mm) and used magnets as input buttons, which required a compass sensor in the phone. An updated design released at Google I/O 2015 works with phones up to 6 inches (150 mm) and replaces the magnet switch with a conductive lever that triggers a touch event on the phone's screen for better compatibility across devices. A port of the Google Cardboard demonstration app to Apple's iOS mobile operating system was released at the same conference.
Google provides two software development kits for developing Cardboard applications, both using OpenGL: one for Android using Java, and one for the game engine Unity using C#. After initially only supporting Android, Google announced iOS support for the Unity plugin in May 2015 at the Google I/O 2015 conference. Third-party apps with Cardboard support are available on the Google Play store and App Store for iOS. In addition to native Cardboard apps, there are Google Chrome VR Experiments implemented using WebGL; phones, including Apple's, that support WebGL can run Google's web experiments.
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