Kindle and Nook head ereader sales

That's according to The State Of The App, a report by McPheters & Company comprised from its iMonitor database of information about 4,000 news and magazine apps.
That makes Nook Newsstand and Zinio the second most popular platform for publishers after iOS (not including the web). And Nook added the most publishers between May and August.
Where does that leave Android apps? Still languishing. only 21 percent of U.S. magazine publishers are currently distributing through Android apps, according to McPheters.
However, it may be true to say that other platforms like Nook and Zinio are more likely to play host to replica page-turners than dedicated interactive app editions, as iPad editions are.
"Unfortunately, the majority of magazine apps are still minimally enhanced PDF replicas, and it seems as if the advent of the iOS Newsstand - and perhaps the Kindle Fire - may be contributing to an increasing trend in this direction," according to the McPheters report. "The publications available on the Fire are likely to skew heavily towards replicas."
McPheters founder Rebecca McPheters tells paidContent: "Since mid-October, we have seen a spate of replicas from publishers like Hearst and Time Inc. that had previously published mostly high-quality apps that take full advantage of the iPad's capabilities."