There are many alternatives to MuPDF for Android if you are looking for a replacement. The best Android alternative is Librera Reader, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to MuPDF and many of them are available for Android so hopefully you can find a suitable replacement. Other interesting Android alternatives to MuPDF are Adobe Acrobat Reader, KOReader, Openlib and MJ PDF Reader.
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.
Seamlessly view, annotate, and collaborate on PDFs with freehand drawing and sticky notes. Utilize cloud storage for effortless access and upgrade for advanced editing and conversion to formats like Word and Excel.
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.
Xodo is the ultimate cross-platform PDF viewer and annotator. Powerful, fast, and optimized for all phones and tablets, Xodo makes it easy to access, edit, share, sync, manage, sign, and more.
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 .
Comprehensive solution for editing, signing, form filling, OCR scanning, commenting, converting, and redacting PDFs, with AI-driven analysis and content extraction, data export to spreadsheets, text-to-speech, seamless use across desktop and mobile, and batch processing.
Orion is a pdf, djvu, xps and cbz file viewer for Android devices, based on mupdf and DjVuLibre libraries.
PDF Viewer Pro is a fast and beautiful app, allowing you to view, search, and annotate PDF documents with ease on your iPhone and iPad.
Besides exceptionally fast launching and displaying speed, Gaaiho Reader is reliable in printing, filling forms annotating documents and adding bookmarks.
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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.