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COPS vs Komga: catalog facts
COPS	Komga
Free Free and open source.	Free No pricing is listed; it is downloaded and run on your own server.
Web, Self-hosted	Web, Self-hosted
Works directly with an existing Calibre library OPDS catalog for ebook reader apps	Handles CBZ, CBR, PDF and EPUB Integrated web reader
Requires a web server you set up and maintain Depends on Calibre for managing the library	Requires running your own server License terms are not stated in the available research
Self-hosted	Self-hosted
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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