When comparing OmmWriter DÄna II vs Scapple, the Slant community recommends Scapple for most people. In the question“What is the best Mac writing software for novelists?” Scapple is ranked 4th while OmmWriter DÄna II is ranked 12th. The most important reason people chose Scapple is:
You can customize your styles, background and font as you wish.
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Pros
Pro Set your own price
Minimum price is $5.11 through the developer's website, customers are welcome to pay more. On the Apple Store it's a set $5.99.
Pro Customizable
You can customize your styles, background and font as you wish.
Pro Flexible
It gives you the freedom to use visual thinking without the hierarchical rigidity of a mind map.
Cons
Con No trial or demo available
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.