Not sure of the exact dates. 'Eucalyptus' which came out in 2009 I think, had an effect that was similar but superior to the previously released 'Classics' app. I still have both and the animation remains very good, although it seems to be buggy on iOS 6 (crashes). I loved when it came out that it created a very believable illusion of actually flipping a page. Much better illusion than Classics and perhaps a little better than iBook IMO.