Calibre vs Komga

Calibre and Komga are both free and open source programs for organizing electronic library. They allow to store books in local folders and access them through a beautiful web interface in the browser. Books can be organized into collections and series, sorted and filtered by metadata parameters.

But Calibre is a universal book manager that supports any e-book formats (epub, mobi, pdf, etc.). It is initially a desktop application for Win, Mac, Linux and the web server is an additional feature. Calibre is much richer in functionality - it has a built-in format converter, the ability to synchronize with e-readers, a powerful metadata and cover editor, as well as support for a large number of third-party plugins. Calibre organizes/copies files into its own folder structure

Komga is a self-hosted web server focused on comics and manga, i.e. it only works with cbz, cbr, pdf formats. It is more difficult to install, but you will be able to create and manage several libraries with different settings (each library can have its owner). Komga's built-in web reader is better suited for viewing comics (especially on mobile devices) - it has convenient navigation by chapters and volumes. In addition, it supports streaming (of heavy comics) to save memory consumption on the mobile device and speed up loading.