Top Alternatives to calibre

Amazon Kindle offers a comprehensive ecosystem for reading digital books, providing dedicated e-readers and cross-platform apps. It allows users to purchase, download, and read a vast selection of ebooks, newspapers, and magazines, synced across various devices for seamless access.

Okular is a versatile document viewer from the KDE community, supporting a wide array of file formats including PDF, EPUB, DjVu, and TIFF. It offers intuitive navigation, robust annotation tools, and features like text selection and saving, making it a powerful tool for handling diverse document types.

FBReader is a versatile and free ebook reader application supporting multiple formats including ePub, Kindle azw3, and fb2. It offers a customizable reading experience across different platforms with features like library management, synchronization, and text-to-speech.

Google Play Books is a comprehensive digital library and ereader offered by Google. It provides access to a vast collection of ebooks and audiobooks for purchase or free download, allowing users to read and listen seamlessly across multiple devices with offline capabilities.

Apple Books (formerly iBooks) is Apple's native e-book and audiobook application for iOS and macOS devices, providing a seamless reading and listening experience with robust library management and sync features.

Polar is a powerful desktop application designed to serve as an integrated reading environment. It allows users to actively read, annotate PDFs and web pages, create flashcards for spaced repetition learning, organize their digital library, and track their reading and learning progress. It's built for focused and deep engagement with digital content.

Delicious Library is a comprehensive digital asset management application for macOS, allowing users to effortlessly catalog and organize their collections of books, movies, music, and video games by scanning barcodes with a webcam or external scanner.

Cool Reader is a highly configurable and lightweight eBook viewer designed for comfortable reading on various devices. It supports multiple formats including EPUB and DOCBOOK, offers extensive customization options for interface and reading experience, and includes useful features like library management, annotations, and sync capabilities.

Moon+ Reader is a highly customizable and feature-rich ebook reader for Android devices, supporting a wide range of ebook formats and offering advanced options for reading comfort and library management.

GoodReader is a powerful document reader and file manager for iOS, excelling in handling large PDF files, annotations, and secure cloud integration, ideal for professionals and students needing robust document management on the go.

Adobe Digital Editions is a user-friendly ebook reader and library management tool, offering support for EPUB and PDF formats. It facilitates reading digital books on various devices and includes features for organizing your collection.

AlReader is a highly customizable and feature-rich e-book reader application designed for mobile devices. It supports a wide range of formats, offers extensive configuration options for reading interface, and includes features like text-to-speech, library management, and synchronization.

ICE Book Reader Professional is a highly customizable e-book reader and teleprompter with a focus on performance and comfort. It supports a wide range of formats and offers advanced features for managing and reading your digital library.

Albite READER is a free ebook reader for Java-enabled mobile phones, providing a customizable reading experience with offline access to your digital library. It supports various ebook formats and includes features like night mode, bookmarks, and library management for a convenient reading experience on older mobile devices.

NOOK is a comprehensive digital reading application developed by Barnes & Noble, providing access to a vast library of ebooks, magazines, and newspapers. It offers a user-friendly interface for reading on various devices and includes features like customization, annotations, and cross-device synchronization.