XYY is a filter-centric app. Its completely FREE. It is shipped with around 27 built-in, high quality filters covering a variety of picture styles, which include professional reversal color film, instant film, selfie (with face smoothening effect), monochrome, lomography and many more.
If you are creative and want more image styles, XYY allows you to edit photos using the various editing tools and to save your edits as personalized filters. These user-generated filters can also be easily shared among XYY users via popular social networks with the #XYY tag.
XYY also allows you to adjust alpha of the filter, adjust sharpen or rotate photo.