There are many alternatives to MuPDF for Android if you are looking for a replacement. The best open source Android PDF Reader alternative is Librera Reader. If that doesn't suit you, our users have ranked more than 50 alternatives to MuPDF and 11 are open source and PDF Readers available for Android so hopefully you can find a suitable replacement. Other interesting open source Android PDF Reader alternatives to MuPDF are KOReader, Openlib, MJ PDF Reader and Secure PDF Viewer.
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.
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.
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.
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions.
Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .
Orion is a pdf, djvu, xps and cbz file viewer for Android devices, based on mupdf and DjVuLibre libraries.
The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.
modern computer flatboat is a mobile pdf viewer written in Qt and using MuPDF's libfitz.
Shelf is a convergent document viewer that supports PDF and EPUB files. With Shelf, you can organize your document collection by creating tags, like other Maui applications.
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I get the impression that MuPDF is not being developed anymore. Found MJ PDF Reader in F-Droid repo. It's minimal and lightweight, and does the job of being a very simple reader.