Apps similar to calibre include Readest, which is open source with a free version. Other options are KOReader, Koodo Reader, Librera Reader and Foliate. Ebook Readers like calibre are a crowded field, with more than 100 alternatives for Windows, Android, Mac, Linux and iPhone.
Readest is a modern, open-source ebook reader for Windows, macOS, Linux, iOS, Android, and the web.
United States
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.
Koodo Reader is a powerful ebook reader designed to provide a simple and easy-to-use reading experience.
China
Librera Reader is a highly customizable and feature-rich application for reading books in PDF, EPUB, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR formats on Android devices.
Slovakia
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Sigil is a multi-platform ebook editor. It is designed to edit books in ePub format.
Serbia
The Kindle app puts millions of books, magazines, newspapers, comics, and manga at your fingertips.
United States
Russia
Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats. Supports chapters, bookmarks, page style. Saves the current reading position. Automatic detection and display of the list of all supported documents on your device.
United States
Discover a vast library of books to search, preview, and buy, read free public domain books, sync page positions, and back up purchases online for a seamless reading experience across multiple devices.
United States
Openlib is an open source app to download and read books from shadow library (Anna’s Archive). The App Has Built In Reader to Read Books.
Calibre-Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing calibre database.
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