When comparing OmniGraffle vs Justinmind, the Slant community recommends Justinmind for most people. In the question“What are the best mockup and wireframing tools for websites?” Justinmind is ranked 13th while OmniGraffle is ranked 17th. The most important reason people chose Justinmind is:
You can create reusable components that you can use over and over again.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Great for web layouts
Pro Reusable components
You can create reusable components that you can use over and over again.
Pro Adaptive and responsive designs
You can create adaptive and responsive designs that will react to the viewport/screen size of the user.
Pro Functional prototypes
You can create HTML prototypes with full interactions.
Pro Supports low, med, and high fidelity
You can create simple wireframes, pixel perfect screens, or anything in between.
Pro Lots of online tutorials
The free Getting Started area has plenty of advice for getting started with Justinmind.
Pro Free forever
After one month trying the pro version, it changes to a completely free version with a few limitations.
Cons
Con Help section could use improvements
Con Mac Only
OmniGraffle is a great tool, but its utility is limited by being trapped on one platform.
Con Expensive
Pricing is $19 per month or $495 for a perpetual license.