DetermApp allows you to use identification keys*, streamed from the web or from local files. Additionally, the DetermApp tools (currently only available in german) allow creating identification keys at a PC (Windows or Linux). It is possible to send identification keys to this Apps from the DetermApp tools using your home network.
You can use the content from any server. This server must serve content as described at https://gitlab.com/determapp/determapp-android/blob/master/package%20sources.md. However, the only known server for this is determapp.de. This server only provides some and only german content.
*A identification key is something which based on questions and the answers you provide tell you which animal you described
