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
Sumatra PDF is primarily designed for users seeking a lightweight and fast PDF reader with basic features, while MuPDF caters to advanced users and developers looking for an open-source solution with extensive customization and support for various file formats. Both applications excel in rendering speed, but MuPDF offers more advanced annotation tools and mobile support.