You might want to try Taskpaper. It's a just a text file so you can edit it however you like. There's an OS X app that's excellent, but the iOS app has been rem

You might want to try Taskpaper. It's a just a text file so you can edit it however you like. There's an OS X app that's excellent, but the iOS app has been removed. However, a number of the better text editors on iOS support it.