The best PDF Reader alternative to calibre is KOReader, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to calibre and many of them are PDF Readers so hopefully you can find a suitable replacement. Other interesting PDF Reader alternatives to calibre are Readest, Librera Reader, Foliate and Koodo Reader.
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.
Readest is a modern, open-source ebook reader for Windows, macOS, Linux, iOS, Android, and the web.
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.
Koodo Reader is a powerful ebook reader designed to provide a simple and easy-to-use reading experience.
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.
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.
Lightning fast with a slick design, Kavita is a rocket-fueled self-hosted digital library which supports a vast array of file formats. Install to start reading and share your server with your friends. book reader, self hosted, manga, comics, free, manhwa, e readers, electronic...
Customizable reader for EPUB, MOBI, AZW, PDF, FB2, and TXT, offering text-to-speech, bookmarks, highlighting, notes, adjustable fonts, color themes, intuitive interface, quick annotations, search, theme customization, and background image support.
Episteme Reader is an offline-first application designed for reading various document formats. It leverages native Android technologies and C++ libraries to provide a performant reading experience with customization capabilities.
Thorium Reader is a free, open source multi-language EPUB reader for Windows 10, MacOS and Linux. It's privacy aware and highly accessible for visually impaired and dyslexic people.
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A very feature-full reading app. I use it with my PocketBook Color and PocketBook InkPad Color and it is much snappier than the default reading app.