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

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