Just connect iPhone/iPad with USB to Mac OS X.
Install and run OBS Studio.
Start Stream from iPhone to Youtube from the
full size camera matrix
USB Connection is faster than WiFi, no any lags. No any overheat for iPhone/iPad device.
Application price is $0.99, You can choose front/rear cameras (rear wide/ultra wide).
Just use transform option inside OBS Studio for rotate video source. You can see video on youtube as example for tranform: Example for use transform option in OBS Studio
No, you can't stream audio.
The main differences:
* Minimalistic, surprisingly easy to use interface
* mobile-adapted and technological
* very cheap for commercial and non-commercial use