When comparing Nook vs FBReader, the Slant community recommends FBReader for most people. In the question“What are the best desktop readers?” FBReader is ranked 6th while Nook is ranked 14th. The most important reason people chose FBReader is:
FBReader features an in built eBook store for users to download eBooks onto their devices through the app.
Specs
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Pros
Pro Free
Available for free from the Windows Store.
Pro Built in eBook store
FBReader features an in built eBook store for users to download eBooks onto their devices through the app.
Pro Simple and fast
FBReader, while offering many options is simple in design, with that allowing for fast use.
Pro Books can be saved to SD card
Pro Cloud sync
FBReader has built in Google Drive sync for the users files, allowing them to store their eBooks online, not taking up room on their local storage.
Cons
Con Windows 8 & 10 only
No Linux or OSX versions are available.
Con Cannot search for books on a SD card
Con No light mode
Unusable if you have astigmatism.
Con UI is bad
User interface is confusing and ugly.