I searched Google for "iOS apps for photographers" and of course I get a ton of apps for taking pictures or editing on the iPhone/iPad. This is not what I am looking for. What I want to know is, what apps out there for iPhone and iPad make for great companion apps.
I have two that I use now and I am looking for other suggestions:
1) Sun Surveyor - I use this to scope out a location and see the sun position for any time of day and date. It uses Google Maps and I can pull up either map or satellite view and see where the angle of light will be. It works better on the iPad because of the larger screen real-estate.
2) CamRanger - I obviously use this for my CamRanger because the CamRanger doesn't work without it.
Again, I am not looking for apps that take pictures or do photo editing. I have heard of apps that can act as grey cards and even an app that in combination with another piece of hardware will make your iPhone a light meter.
So, what other good tools exist for iPhone and iPad?

