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Chaka Book Reader vs Episteme Reader: catalog facts
Chaka Book Reader	Episteme Reader
Free Free and open source under AGPL-3.0-or-later.	Free Free and open source under the AGPL-3.0.
Android	Android, iOS
Opens a very wide range of document and comic formats Reads files directly from archives	Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text
Android only No release downloads listed on the repository	Desktop and iOS versions are not confirmed as released Contributions require signing a CLA
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: AGPL-3.0
No account needed	Not stated if an account is needed
Works offline	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.