Phone controller app for dslr

Not sure if this is the right place to post this. I was wondering if anyone knows of a phone app that can be used while filming with a dslr as an external live view monitor as well as maybe some control? I have been using dslr controller on a tablet, and love it, but I can't seem to find anything similar for my iphone 7. Thank you in advance.

Not sure if this is what you are looking for https://www.youtube.co​m/watch?v=62lFMATApaI
and this https://itunes.apple.c​om …r-camera/id552765874?mt=​8
and here https://www.youtube.co​m/watch?v=hn1lJK58u-o

Thank you for the response. the only thing is- the first link appears to extend a computer monitor I didn't see anything about a dslr display (I would love to be wrong about that), the second (cam ranger) from what I can tell requires an external device and the app is required to make it work, and the third is exactly what I'm looking for, except I can't seem to find any comparable apps that are for ios devices- there are a bunch for android but unfortunately, I don't have an android to use. I am curious about cam ranger though, anybody have any experience with it?