Compared to the 2.0 series of the app, Calibre 3.0’s biggest new feature is an entirely re-written Content Server component that lets users read book in-browser on their phone and tablet devices. Best of all, the implementation also works offline, so you won’t need an Internet connection to read your favorite books while on the go. Another interesting feature of the major Calibre 3.0 release is support for HiDPI and Retina screens, which is a long-requested feature. To celebrate the release of Calibre 3.0, the developer also updated the splash screen, which you should see the next time you update and restart Calibre.