"Comic apps" refers to mobile applications or software programs that allow users to read and interact with comic books or graphic novels on their smartphones or tablets. Full definition
Aside from a promotional edge for Image with readers wary of digital comics apps, the publisher is also anticipating more benefits for its creators. (cbr.com)
At the moment, there appears to be only one dedicated comics app in the store, although there are several ways to read comics using other apps. (goodereader.com)
Many other comic apps don't work either because of the PDF issue. (goodereader.com)