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Librera Reader vs ReadEra: catalog facts
Librera Reader	ReadEra
Free Free to download.	Free Free to download and use without ads, according to the developer.
Android	Android, iOS
Wide format support including DjVu and comics Auto-scan of book folders with reading progress	Opens EPUB, MOBI, PDF, DjVu, Word, FB2 and comic files Reads books directly from ZIP and RAR archives
Android only Many settings can take time to learn	Closed source Mobile only, with no desktop version
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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