By Synthetic LLC. $1.99 for basic features, with 99-cent add-ons to give you more imaging options. For iOS only.
Unlike most filtering apps, on Hipstamatic you dont adjust a photo after you've taken it. Instead, you choose different virtual lenses, flashes, and film beforehand. You cant change the setting after you take the shot.
Watch out, the app is not very intuitive, but once you get a sense of which virtual lens works best under which conditions, you can create stunning photos.