When comparing Librera Reader (PRO) vs MEGA, the Slant community recommends Librera Reader (PRO) for most people. In the question“What are the best PDF viewers for Android?” Librera Reader (PRO) is ranked 4th while MEGA is ranked 6th. The most important reason people chose Librera Reader (PRO) is:
Best app so far.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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!
Pro Cross platform
Linux, Windows and Mac.
Pro Client-side encryption
All files uploaded to Mega are first encrypted on the users side. To access files a decryption key must be supplied. For ease of use, the decryption key can be appended to the URL you share.
Pro 50GB free
50 GB trial for new accounts after registering for a month, then 15 GB. There's also three upgrade plans, starting at 500GB and $110/yr. 15GB may not seem much, but Dropbox only offers 2GB for the free plan. This is better than Google Drive because Google Drive storage is shared with all the Google services you are using.
Pro Functional web interface
Pro Easy to use
Just drag and drop files in the browser window, then create a link for sharing. You will need an account to create a link. To streamline the process for new users you can start uploading as soon as you access the website and create an account while it's uploading.
Pro Respects personal privacy
They will never look through your files unless they ask for permission.
Pro Open source client
Cons
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.
Con Some times adds blank pages after an image
Con Flips pages by itself, cannot get it to stop
Con Slow syncs
Servers are slow, and the new app is terrible.