It has been over a year since the developer had an update for the iPhone version of this app. In fact, it can no longer be found for sale in the App Store. Which is fine by me, because after using this app for a little while, I see that the resolution is so low that it creates nothing but low-quality images. With even a slight amount of zoom, the pixels become apparent very quickly.
There is also no Settings menu in which to increase the resolution, so you are stuck with the default low-resolution setting.
This app feels to me to be more a toy than a serious tool for artists.
Pro App Reviews about ArtRage for iPhone