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Chaka Book Reader vs ReadBear: catalog facts
Chaka Book Reader	ReadBear
Free Free and open source under AGPL-3.0-or-later.	Free Free and open source under the MIT licence.
Android	Android
Opens a very wide range of document and comic formats Reads files directly from archives	Reads PDF and CBZ comic files in one app Many reading options: layout, theme, spacing, language
Android only No release downloads listed on the repository	EPUB support is described as unfinished Small, young project with one main developer
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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