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Cosmic Comics vs Houdoku: catalog facts
Cosmic Comics	Houdoku
Free Free and open source under the GPL-3.0 licence.	Free Free and open source.
Linux	Windows, macOS, Linux
Handles comics, manga and ebooks in one app Open source under GPL-3.0	Reads local manga files and extension sources Vertical and two-page reading modes
Official page gives very little feature documentation Linux build is the only one confirmed	Desktop only, with no mobile app Online sources depend on extensions
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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