Q:

What is the current evaluation of a sky map application for mobile devices?

Which sky map application for mobile devices have the best "feature satisfaction"-to-investment ratio?
I would like to have a comparison between "sky map" applications for mobile devices and it should be a factual comparison made by astronomy professionals, enthusiasts, and hobbyists. The result would be a user guideline on valuable applications.
I am always looking for great tools for amateur and professional astronomy to use for outdoor night observations.
(Tagging suggestion: this question can be part of a "How to make observation easier", subpart "mobile application".)

A:

Define "best".
As always, there's no one-size-fits-all answer. Are you just a casual observer, looking mostly for naked-eye objects? Or are you looking through a telescope for deep-space stuff? Is your scope a go-to that can be interfaced with and controlled from the phone?
Here are some examples, look at the features and decide what's best for you:
SkySafari 3, either plain, or Plus, or Pro. My favorite. A lot of folks hauling big dobs and whatnot use it.
Star Walk
Stellarium - good for casual naked-eye gazing but not much else.
StarMap 3D, either plain or Plus
Pocket Universe

