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Houdoku vs OpenComic: catalog facts
Houdoku	OpenComic
Free Free and open source.	Free Free to download, with an optional donation page.
Windows, macOS, Linux	Windows, macOS, Linux
Reads local manga files and extension sources Vertical and two-page reading modes	High-quality Lanczos3 downscaling for sharp pages Reading view customizable for comics and manga
Desktop only, with no mobile app Online sources depend on extensions	ePub and PDF support is basic Focused on reading rather than library management
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	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.