Compare software

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