While 6.6.1 includes specific bug fixes, it shares the major features introduced in the version 6 branch:
Calibre 6.6.1 is an open-source e-book management tool designed to organize, convert, and sync your digital library across various devices. Released as part of the Calibre 6 series, this version emphasizes internal improvements and foundational features like . Core Features of the 6.x Series calibre 6.6.1
: Index your entire library to search for specific words or phrases inside your books. While 6
: Native support for Apple Silicon (macOS) and ARM (Linux). While 6.6.1 includes specific bug fixes