Oh man. Writing any kind of text on iOS is easy thanks to Markdown and the profusion of plain text editors in the App Store. But revising that text? Making edits and tracking them between author and editor? You need Microsoft Word for that. You need a computer for that.
But what if there were a Markdown-like markup syntax for plain text copyediting? You know where I’m going with this don’t you? That tool is here, and it’s called Critic Markup.