According to Tianyancha's introduction to this application center, it can be found that this so-called China Net Chain APP is actually the mobile application software of this China Net Blockchain Financial Technology Application Center, so both of them belong to China Net Cloud Blockchain Technology Co., Ltd.
In addition, if you want to know more about this online chain APP, Tianyan also suggests its download method, as shown in the figure below, so I won't go into details.