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Paperback vs Houdoku: catalog facts
Paperback	Houdoku
Free No ads; the site does not list any charges.	Free Free and open source.
iOS	Windows, macOS, Linux
No ads Extensions add content sources	Reads local manga files and extension sources Vertical and two-page reading modes
iOS and iPadOS only Content depends on third-party extensions	Desktop only, with no mobile app Online sources depend on extensions
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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