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