Video: OmniGraffle vs Zen Flowchart

Last updated: December 31, 1969

OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click. Create flow charts, diagrams, UI and UX interactions, and more. Whether you need a quick sketch or an epic technical figure, OmniGraffle and OmniGraffle Pro keep it gorgeously understandable.
Zen Flowchart is the simplest tool to create flowcharts, org charts, process charts, sitemaps, and more. With a minimal and intuitive user interface, creating diagrams with Zen Flowchart is very easy and delightful. The online tool also has Export and Publish features, which allow users to easily share their work.

OmniGraffle was updated more recently than Zen Flowchart:

2018. OmniGraffle for Mac gets the new Stencil Browser experience

In the new version of OmniGraffle 7.6 for Mac the Stencil Browser can be positioned in the left or right sidebar, or the two views you’re familiar with: popover and detached window. You can add new objects to any stencil by dragging them from the Canvas to the Stencil Browser! (Just hold Option while doing it.) Multiple Stencils can be selected for use at a time, rearranging or reorganizing by with Folders is a snap, and more.