There used to be two version of this app – Fractile which was ad-supported, and Fractile Plus which was for sale. No more: The ad-supported version has been retired, and Fractile Plus is now available for free. Enjoy! I’d also like to extend my thanks to all the folks who have supported the app so far.
App updates: It seems the main feature requests right now are a bookmark / sharing system, and color cycling. The bookmarks will require some thought to get a nice implementation and may require some form of cloud-based storage / voting scenario. Color cycling is largely a UI issue (I’d prefer not to clutter up the interface with more buttons.) Also the app currently only uses a single worker thread to compute the fractals, it should be simple to spawn an extra one to gain an 80+% speed-up on the iPad 2.