Yeah, that's not true at all. Manga on a 8-10 inch-tablet can be far superiour to the poor paper manga are usually sold at. Though it's true that it also depends on the reading-app/service.
But short search says "Manga Storm CBR" is according to your demand. Search for cbr, which is the common fileformat for comic-archives. You can also widen the search and search for comic-apps or reader-apps in general. Manga seems to be often a bit to specific in those cases.