Before it unveiled Daydream and the Daydream View headset, Google's push into VR was called Cardboard. This consisted of a simple and cheap headset design, an actual cardboard headset made by Google, as well as an app ecosystem for Android. While the first two of those have been superseded by the release of the Daydream View (which is available today), what about the Cardboard apps? Do they run on the Daydream View? At the moment, the answer is no, apparently, because the Cardboard app can't yet use the View's controller. It does, however, already recognize that you have a Daydream View....
Source: http://www.gsmarena.com/googles_daydream_view_vr_headset_will_support_cardboard_soon-news-21568.php