OmniGraffle for iPad isn't designed as a companion to the Mac app: it's designed as a complete standalone app, with support for multiple canvases, shared layers (only available in the Pro app on Mac), tables (also Pro-only on Mac), smart guides, automatic layout, text formatting, variable substitutions, and so on.
In fact, in some respects OmniGraffle for iPad is a dramatic improvement over the Mac app: the touch interface makes it much easier to create freehand sketches, and if you've ever tried to use OmniGraffle heavily on a MacBook I think you'll agree that the iPad app provides a much better mobile experience. (Given the choice between bringing OmniGraffle for iPad or MacBook to a meeting, I'd choose OmniGraffle for iPad.)
At half the price of the Mac app, OmniGraffle for iPad is already significantly less expensive than its Mac editions—so much less expensive that I worry about the degree to which it might cannibalize our Mac sales.
As
we said on our blog:
$50 may be too much to spend on entertainment (although many console games cost more), but we don't intend OmniGraffle as a casual purchase: OmniGraffle for iPad is designed as a professional productivity tool, one which will make you more productive and will save you time and money every week.
We feel confident you will be happy with the depth of the feature set, pleasantly surprised by some brand-new options only available on the iPad, and overall find OmniGraffle for iPad to be a good value. As always, we welcome your feedback, so feel free to talk to us about any concerns you have!