1Writer!

1Writer combines all the basic text editing features you would expect with all the advanced features you will ever need. Use 1Writer to write, research, revise, and share your ideas with maximum efficiency.- - - - - - - - - -The only Dropbox- and Markdown-enabled text editor for iPhone thats clicked with me has been 1Writer. * Compatible third-party apps include: Drafts, Terminology, Day One, Editorial, Phraseology, Byword, Ulysses, Tumblr, Chrome, Gmail, Launch Center Pro, Tweetbot, Dispatch, Due, Fantastical, Clear, OmniFocus, Things, 2Do and many more.