When comparing MuPDF vs Librera Reader (PRO), the Slant community recommends MuPDF for most people. In the question“What are the best PDF viewers for Android?” MuPDF is ranked 2nd while Librera Reader (PRO) is ranked 4th. The most important reason people chose MuPDF is:
It was written in C and opengl, so your hardware was used fully.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Super fast
It was written in C and opengl, so your hardware was used fully.
Pro Vim-mode shortcut keys
Super easy to use with rapid response.
Pro Excellent for presentations
Pro Annotation capability
With mupdf-gl, you can do most of the annotations and comments.
Pro Has all the functionality one needs - nothing is missing and there's nothing excessive
Best app so far.
Pro Fast animation
Pro FOSS
GPL v.3.
Pro Can read aloud texts
Customize the voice with pitch, speed and do whatever you want with it.
Pro UI and reading customization will blow your mind
You can even customize CSS code to fine-tune display of epub books. The best reader to handle online catalogs and TTS reading!
Cons
Con No print option
Con No two page mode
Con Not enough functionality
If you want "minimal," you got it.
Con The annotation does not have good shortcut key support
Con Cannot customize shortcut keys
Con Free version contains ads
The Pro version has no problem. Alternatively, the fdroid version works as well, though it might be annoying to those who want cloud integration because the fdroid version doesn't have cloud integration.
Con No way to set a "home" folder
You have to press the back button a ridiculous amount of times to exit the app and then browse back to your books when you want to read again later.
Con Cannot reverse PDF reflow to return to normal view without exiting the PDF and opening again
Very annoying when you want to view graphics and tables etc.