NAD OSD 4+

I'm using this app with my T758 V3i and it pulls information almost as soon as the AVR is turned on.
Great for diagnostics should you notice things not sounding quite right; to see if a previous setting like up mixing or tone controls/Dirac profile are engaged... among other things.
The remote option is great for making some of the changes I typically make between media types too, I have a different Dirac house curve profiles for reference levels and late-night soft listening, this app makes it a single-tap affair.
Since the remote gives visual feedback on what setting you are on, and can further verify on the OSD tab, you can actually tuck the receiver away in a cabinet in another room since you won't really need to refer to the AVR screen anymore.
The one feedback I have is maybe I'd switch EARS for Enhanced Stereo up mixing mode, or add the ability to switch to Enhanced Stereo mode. Most listening rooms are already bright and reverberant, so the EARS effect is not as useful in that application, at least not to me.

This app works with my upgraded T-187 perfectly! Gotta like all the extra info it provides. The developer is a great communicator (he actually re-wrote the app to include my system!) and obviously very competent.

Unlike the NAD electronics apps this one works as advertised. Very handy and informative. Gives quick glance to AVR state and you can make “on the fly” adjustments.