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Cosmic Comics vs ACBR: catalog facts
Cosmic Comics	ACBR
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the AGPL-3.0.
Linux	Windows, Linux
Handles comics, manga and ebooks in one app Open source under GPL-3.0	Reads common comic archives plus pdf and epub Converts and creates comic books in several formats
Official page gives very little feature documentation Linux build is the only one confirmed	No macOS version listed AES-encrypted cbz files are not supported
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	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.