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MComix vs Cosmic Comics: catalog facts
MComix	Cosmic Comics
Free Free and open source under the GPL 2.0 licence.	Free Free and open source under the GPL-3.0 licence.
Windows, Linux	Linux
Reads comics straight from CBR, CBZ, CB7 and PDF Manga mode for right-to-left reading	Handles comics, manga and ebooks in one app Open source under GPL-3.0
No macOS build listed GTK interface looks out of place on Windows	Official page gives very little feature documentation Linux build is the only one confirmed
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	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 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.