2024-06-13 00:00:00 Cardboard puts virtual reality on your smartphone. The Cardboard app helps you launch your favorite VR experiences, discover new apps, and set up a viewer. To fully enjoy this app you'll need a Cardboard viewer. Learn more and get your own Cardboard viewer at http://g.co/cardboard. Share your experience through our Google+ community at http://g.co/cardboarddevs.