Hi anons. I'm looking for a app to use for reading manga (usually .zip or .cpz files). I don't care about it having networking capability or the ability to browse manga sites or anything, I just want something that gives a decent viewing experience for manga I've already downloaded.

Unfortunately the 1st gen kindle fire is on a pretty old android version so a lot of current apps like Tachiyomi aren't compatible.
Currently I'm using Perfect Viewer but it's annoyingly crashy so I'd like to find something better.