You can download Microsoft PIX from the Apple app store now for free.  The claim to fame (according to Microsoft) is that it uses artificial intelligence to take the best possible shot every time without forcing the user to fiddle with any settings.

This computer voodoo is possible because the app takes 10 pictures every time you press the shutter button. Some right before you pressed the button and some right after. It uses data from every shot to build the best possible image (Apple's default app also does this very same thing but it seems Microsoft is pushing the technology a little bit more). Even though it selects the best possible shot and discards the rest, it uses data from app the pictures (even the ones it will delete) to reduce noise, brighten faces and ensure it has captured colours as accurately as possible.

Another cool trick up its sleeve is motion analysis. If it believes there is motion in the series that could enhance the image then it will animate that worthwhile section and create a "live" photo. It could do this for a sparkler on a cake or hair blowing in the wind or a beautiful waterfall behind the subject. 

All of the intelligence is hidden from the user. There are no settings to change or configurations to optimize, everything is taken care of for you. It is the kind of app even your mother can use.

It is smart enough to detect faces and optimize the settings for it/them. It will detect open eyes. I started playing with this app a couple of hours ago and so far like it enough to put it on the first page of my iPhone next to the default camera app.

You can checkout this Microsoft Research page to learn more about the cool tech behind the app.