The BI app is perfectly useful for me (on Android - haven't used the IOS version).
There's also the web UI (UI3) which can work on a phone or tablet.
Try it, you'll like it!...
and keep in mind, that whatever your remote viewing solution is, you need to take the proper precautions, security-wise.
BI is not unique in that respect. (ie, VPN vs open ports on your router via UPNP, etc...)