Memmy is an iOS only app though. It would like pretty out of place on android as it is right now imo. And personally I find the design to be a little more clean than Mlem right now.

If you use sites like this and you have epubs and pdfs to contribute, make sure that you do! I recently uploaded a book I had access to from my school days for others to use through libgen. I had to search really hard to find it when I didn’t have a lot of money for textbooks. I hope what I uploaded helps others. Be sure to contribute!