Calibre 5.0 is available for Windows 8 and up, Mac OS X, and Linux officially. Things have not changed compatibility-wise. The new version is the first major upgrade after the release of Calibre 4.0 in 2019 it offers new features such as highlighting, improved searching, and dark mode support in additional program areas. The developers of the e-book manager Calibre have released Calibre 5.0, more precisely Calibre 5.0.1, for all supported platforms on September 25, 2020.