Hipstamatic is not just the granddaddy of retro photo apps; it's the king. Behind its appealing (though admittedly clunky) simulated vintage-camera interface are a selection of simulated lenses, film, and flashes you can select to tweak the way images are captured for nearly endless combinations: wide angle or standard, saturated color or more flat, hot flash or none at all. The idea of having free and paid options for add-on lenses and films may sound dated in the age of free apps, but we still think the results are worth it. Of special appeal: The viewfinder intentionally builds in a little parallax error, so you never quite know exactly how your images will look. Also: The option to order prints right from the app is pretty hip. [$1.99; iOS]