MuPDF is a free and open-source software framework written in C that implements a PDF, XPS, and EPUB parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks. Developed by Artifex Software, Inc.
License: Open Source
WinDjView is primarily focused on providing a user-friendly interface for viewing and annotating PDFs, with good customization options. In contrast, MuPDF excels in speed and supports a wider range of file formats, making it ideal for users who need fast rendering and advanced text extraction capabilities.