I'm the author of Polar if you guys have any questions. We're working on EPUB. We want to do it right so it's taking a bit longer. A lot of our users are usi

I'm the author of Polar if you guys have any questions. We're working on EPUB. We want to do it right so it's taking a bit longer. A lot of our users are using Calibre to convert from EPUB to PDF. We've seen a LOT of uptake among students/academics so PDF has been the main focus so far. We also have HTML capture and are working to unify the EPUB and HTML capture functionality. We're trying to be far far more than a reader and view polar as more of a spaced repetition platform with integrated reading so that it's insanely easy to read while learning using spaced repetition. Anyway... if you have any questions AMA.