Download: TtV PS Lite on the iPad – Free
This app doesn’t do much at all but it’s pretty nice none the less. It comes with 4 camera effects, three colour filters, an opacity adjuster and brightness and contrast adjusters.
It is simple to use and can be upgraded to a paid version. For that you get 30 viewfinders and full resolution output.
The grunge effects are pretty nice while limited.
This isn’t a fancy app but it is easy to learn and to use.