Librera Reader

There's no problem with opening most of the file formats, no crashes or smth else. BUT it really lack quality of life features. I used it mostly for PDF and DjVu, and reading these file formats doesn't feel comfortable. When changing pages, instead of return at the start of the page, is stands at the same place and you have to scroll each time to the start. It doesn't have auto-fit function, so you need to zoom each time to hide borders and make text larger. The page can be moved anywhere on the screen, instead of fixing it to the borders boundaries. I think among open source apps it's one of the best, as it opens a lot of file formats, but now I switched to ReadEra. It's just more comfortable to use. Maybe the only thing I now miss is custom interface color and background images P.s. make sure you download it from F-Droid, because the Google Play version has ads

While Librera has advanced features, it is also a very easy to use PDF viewer on Android. Once given permission, it finds PDFs in a jiffy. Even better than an easy link to Google Drive, once you set Sync option by scrolling down the 3-horizontal bar icon on the left side, your PDFs there show instantly.

Great functionality, format compatibility and has an F-Droid version.

tts continues to speak with the screen off. MoonReader+Pro cannot.

I love Librera as it gives me the smoothest format for my self-published eBook series!

I switched from FBReader to Librera mainly because it's much easier to define and use search engines and dictionaries in Librera. I haven't tested all the numerous features yet, but it seems to have everything I need for ebooks and then some.

It can read comic formats too, but doesn't handle them as well as other dedicated apps like Tachiyomi. Scaling and auto-cropping don't work as well, and it doesn't have Tachiyomis' very useful overlay filter, so for CBR/CBZ I'm sticking with Tachiyomi for now.

Be aware that although the PRO version is available for free on F-Droid, it lacks internet-related features. Here's what the F-Droid repo says:

“For better security, the F-Droid version, is based on the latest MuPDF 1.16.1 and does not require access to the Internet.

For the above reason, some Internet-related features of Librera Reader are missing in its F-Droid version:

1. Access to OPDS (Calibre) Catalogs
2. Google Drive Syncing
3. Access to Clouds (Dropbox, Google Drive, OneDrive)
4. Saving (sharing) pages from web browsers
5. Rendering MathML formulas in epub3 books
6. Access to the What's New page”