Go to app
This has become my go to app for iPhone photography, to the point that I have been converting all of my friends with a quick realtime demo. Then they are hooked. The dramatic mode can over saturate from time to time but this can be easily corrected in post processing or one can simply shoot the shot again in lively mode. The slider shows you what changes you will get before you save the image so it is easy to tell. Certainly this app is well worth the money!
SLGPhotog about
vividHDR