The main work effort between Calibre 3.0.x and 4.0.x has been handling the migration from Qt WebKit (no longer maintained) to Qt WebEngine (which is maintained). This time has been spent mostly in making the calibre Content server ever more capable as well as migrating calibre itself from Qt WebKit to Qt WebEngine, because the former is no longer maintained,” writes Kovid Goyal, Calibre’s chief developer.Īmong the new features and improvements that are on offer in Calibre 4.0 is a new ‘distraction free’ ebook viewer that, early feedback suggests, is a step down from the previous one (and also apparently much slower). “ It has been two years since calibre 3.0. A new version of Calibre, the open source ebook manager (and then some), is now available to download for Windows, macOS and Linux.Ĭalibre 4.0 is the first major release of the app in nearly 2 years and succeeds Calibre 3.0, which was released back in 2017.
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