When comparing Writedown! vs iA Writer, the Slant community recommends iA Writer for most people. In the question“What are the best Markdown editors for OS X?” iA Writer is ranked 11th while Writedown! is ranked 45th. The most important reason people chose iA Writer is:
The Noise Free Writing Experience is one of the first approaches to create a first class distraction-free environment. The feature hides the Mac program bar when you start writing.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Completely free
This project is distributed under LGPL
Pro The first free markdown editor in Mac App Store
Pro Noise Free Writing Experience removes even the program bar
The Noise Free Writing Experience is one of the first approaches to create a first class distraction-free environment. The feature hides the Mac program bar when you start writing.
Pro A mode that brings focus to the sentence you're working on
Enabling Focus Mode will dim the whole text except the sentence you are currently writing on.
Pro Can tell how long it would take to read through what you've written
Pro Markdown support
Pro Syncs using iCloud and Dropbox
iA Writer can sync documents using iCloud or Dropbox from within the editor for use across multiple devices.
Pro Create whole document by including separate images/markdown docs
This is new and very awesome feature in iA Writer 4.0.
Pro Can export a Word document
Pro Available for all Apple devices
iA Writer is available for Mac, iPhone and iPad.
Cons
Con Lack of features
The app only supports simple left preview/right editing view, nothing else.