For those unfamiliar, Ulysses is a popular writing app for Mac computers. One of the reasons behind its popularity is its clean and simple interface that lets you just write, but at the same time offering up a ton of functionality under the hood that you might appreciate once the creative stuff is out of the way.
With the iPhone app (which also makes it a universal app for the iPad), users will be able to perform cross-platform iCloud sychronization, see Spotlight integration, support for 3D Touch, Split View, Slide Over, and more. Users will also be able to format their documents with pictures, links, notes, color, and also export their writings to a bunch of formats like DOCX, ebooks, PDF, and etc.
Unfortunately the app does not come cheap. Ulysses has been given an introductory price of $19.99 which is admittedly expensive for a word processing document, but if you loved the Mac version, maybe you could justify paying for its iOS counterpart.