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KOReader vs Chaka Book Reader: catalog facts
KOReader	Chaka Book Reader
Free Free and open source under the AGPL 3.0.	Free Free and open source under AGPL-3.0-or-later.
Linux, Android	Android
Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT	Opens a very wide range of document and comic formats Reads files directly from archives
Installing on a locked e-reader means jailbreaking it first, at your own risk The settings menus are deep and not self-explanatory	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
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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