The best PDF Reader alternative to KOReader is calibre, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to KOReader and many of them are PDF Readers so hopefully you can find a suitable replacement. Other interesting PDF Reader alternatives to KOReader are Okular, Readest, PDFgear and Librera Reader.
Free e-book manager with features including library management, format conversion, syncing to devices, internet-independent operation, built-in viewer, news download as e-books, text-to-speech, privacy focus, extensible plugins, and no registration or tracking.
India
Multi-platform document viewer supporting PDF, ePub, comics, images, and Markdown with annotation, digital signature verification, tabbed interface, sidebar navigation, text selection, text-to-speech, magnifier, search, dark mode, and plugin support.
Germany
EU
Readest is a modern, open-source ebook reader for Windows, macOS, Linux, iOS, Android, and the web.
United States
Read, edit, convert, merge, and sign PDF files across devices, for completely free and without signing up.
Singapore
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.
SlovakiaEU
Koodo Reader is a powerful ebook reader designed to provide a simple and easy-to-use reading experience.
China
MuPDF offers a highly versatile PDF, XPS, and eBook interpreter, customizable as a renderer, viewer, or toolkit. Features include digital signatures, redactions, form filling, annotations, and page manipulation, ideal for mobile, eBooks, and embedded apps supporting Java, C++, and Python.
United States
Russia
Innovative book reader with powerful controls & full functions.
China
Material3 eBook reader - Book's Story. Built with Jetpack Compose. Free & Open Source & Ad Free. 4 supported file formats (.txt, .pdf, .epub, .fb2), 2 supported languages. Lots of customization.
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.
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
