Editorial is a $5 editing app, mainly for coders, especially Python, for your iPad. In Charlie Sorrel’s (cultofmac.com) words:
The editing part of the app is enough to make this your go-to editor on any platform. First, it has an inline preview for Markdown. That is, it italicizes and bolds text inline, and color-codes links and so on to make the whole text easier to read. A full preview can be seen at any time by swiping in a pane from the right.
This pane can also be toggled between four functions: Preview, help, an in-app browser and a “console”, or “Python scratchpad”, where you can quickly paste in lines of code to test.
Read the full review here.