Hikvision's standard App for use with their security cameras and recorders is called Hik-Connect.
It is available for both Android and Apple's IOS based mobile devices, from the usual App stores.
Hikvision App
It is available for both Android and Apple's IOS based mobile devices, from the usual App stores.
For Android devices, from the Google Play store here:
For Apple IOS devices, from the iTunes store here:
...Hikvision App