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MangaReader vs Cosmic Comics: catalog facts
MangaReader	Cosmic Comics
Free Free and open source under the GPL-3.0 or later licence.	Free Free and open source under the GPL-3.0 licence.
Linux	Linux
Opens image folders and many comic archive formats Folder tree for switching between series	Handles comics, manga and ebooks in one app Open source under GPL-3.0
In maintenance mode, bug fixes only Reads local files only, no online sources	Official page gives very little feature documentation Linux build is the only one confirmed
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-only
No account needed	Not stated if an account is needed
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 October 1, 2026

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