More than a month after launch, consumers' adoption of iPad Air continues to outpace the iPad 4 by a wide margin, according to data provided by Fiksu.
Fiksu samples millions of so-called app events (launches, purchases, and registrations) every hour from applications that use its SDK (software development kit), then charts the percentage of active iOS tablets on each version at a set date after launch.
"At 35 days since release, Fiksu is tracking an adoption rate of 3.35 percent for the iPad Air, versus a 1.51 percent rate recorded during the same time interval after the release of the iPad 4," Fiksu said in a statement.
Because Fiksu's apps are only installed on a percentage of all iPads -- which Fiksu says is "millions of iPads" -- the adoption rate should be considered to be merely one data point. Companies like Groupon, VH1, Barnes & Noble, and Hearst Magazines use Fiksu's software.
Apple shipped 22.9 million iPads in the fourth quarter of last year. A forecast -- from -- predicts Apple will ship more than 23 million iPads in the fourth quarter of this year. A large number of those -- about 10.5 million -- are projected to be the iPad Air.
The iPad Air's appeal is tied, in part, to the redesign. Its predecessors, the iPad 3 and iPad 4, were relatively thick and heavy designs.
"Apple has delivered a proper exterior redesign, crafting a substantially thinner and lighter tablet...[and] maintains the battery life of its predecessor and offers significantly better performance," said CNET Reviews.
"The response to iPad Air has been incredible," Phil Schiller, Apple's senior vice president of Worldwide Marketing, said in a statement last month.
And the iPad Mini Retina has been doing well, too, compared with its predecessor., and adoption appears to be trending slightly higher this week.
Updated at 11:50 p.m.: This post has been updated with additional information in the iPad shipment forecast discussion.