When comparing iA Writer vs Scapple, the Slant community recommends iA Writer for most people. In the question“What is the best Mac writing software for novelists?” iA Writer is ranked 2nd while Scapple is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pro Can tell how long it would take to read through what you've written
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 Create whole document by including separate images/markdown docs
This is new and very awesome feature in iA Writer 4.0
Pro Markdown support
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 Available for all Apple devices
iA Writer is available for Mac, iPhone and iPad.
Pro Can export a Word document
Pro Syncs using iCloud and Dropbox
iA Writer can sync documents using iCloud or Dropbox from within the editor for use across multiple devices.
You can customize your styles, background and font as you wish.
It gives you the freedom to use visual thinking without the hierarchical rigidity of a mind map.
Con No Windows or Linux support
Con It looks abandoned
Despite being a great software as it is, theres no update for more than a year : either to fix minor bugs, or implement new functions.