The EZConnect app will change its service name to VIVOCloud in version v2.1.x by the end of May, 2017. The transition will not affect the existing service. It is advised to update related products (app, NVR) to the latest version.
Vivotek's main mobile app is iViewer.
Vivotek EZConnect Overview
The EZConnect works with a server hosted by VIVOTEK for bridging and tunneling video requests between client devices and network cameras/CMS/NVR. The utility simplifies and facilitates network configuration for access across the Internet. With this utility, you do not need to configure IP port forwarding on router or set up a DDNS address for the NVR. You do not even need to know the IP address of the NVR. The EZConnect utility automatically manages the network parameters required for making the connection. The EZConnect comes with viewing and playback interfaces very similar to those in the iViewer utility.