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Librera Reader vs Chaka Book Reader: catalog facts
Librera Reader	Chaka Book Reader
Free Free to download.	Free Free and open source under AGPL-3.0-or-later.
Android	Android
Wide format support including DjVu and comics Auto-scan of book folders with reading progress	Opens a very wide range of document and comic formats Reads files directly from archives
Android only Many settings can take time to learn	Android only No release downloads listed on the repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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