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Not sure if you saw, but I edited my response to add what I use currently, which is Komik, in case you haven't tried it. It's pretty good.
I'm loading my comics into the Challenger library... it's taking a while. Avengers. :)
This would be handy. I use Komik ([link]) normally and that sorts them using pre-determined folders which makes it easier when you have numerous comic series to get through.
Also, maybe an option to read the next comic at the end to save going back to the main screen first, only a minor bugbear really.
I used to read manga from manga plus but after it changed name to manga blitz, I have been using komik reader.
Since I only read offline manga, I don't know about online reading manga app.
It's a pretty nice site, their in-browser view is pretty good but personally I prefer using Komic so I download the .zips provided. On FAKKU for example half the .zips aren't available, still haven't had that issue on DoujinMoe.
Though it hasn't been updated in a long time, I really suggest Komik.
Oh, I found it! Here you go!