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Chaka Book Reader vs Fossify Documents: catalog facts
Chaka Book Reader	Fossify Documents
Free Free and open source under AGPL-3.0-or-later.	Free Free and open source under the GPL 3.0, with no ads.
Android	Android
Opens a very wide range of document and comic formats Reads files directly from archives	Opens PDF, DOCX, Markdown, CSV and HTML in one app Edits text, Markdown and CSV files
Android only No release downloads listed on the repository	Still in beta DOCX files are view-only
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-only
No account 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.