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FBReader vs Librera Reader: catalog facts
FBReader	Librera Reader
Freemium The reader is free. Some format plugins and premium features are paid.	Free Free to download.
Windows, macOS, Linux, Android, iOS	Android
Same library and reading position across desktop and mobile Reads custom OPDS catalogues as well as local files	Wide format support including DjVu and comics Auto-scan of book folders with reading progress
Some features and formats need paid add-ons The desktop builds lag the mobile apps	Android only Many settings can take time to learn
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.