The app has a clean and user-friendly interface. Calibre Ĭalibre is a free and open-source eBook manager with a huge base of developers and testers. If you prefer reading eBooks on your smartphone, we recommend checking out our picks for the best EPUB readers for Android and iOS. While some of these get you basic reading functionality, others offer additional features to enhance your reading experience.įollowing is a list of the best EPUB readers for Mac and Windows. There is a wide range of EPUB reader apps for Mac and Windows computers, free or otherwise.