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COPS vs Ubooquity: catalog facts
COPS	Ubooquity
Free Free and open source.	Free Free to download and use.
Web, Self-hosted	Windows, macOS, Linux, Self-hosted
Works directly with an existing Calibre library OPDS catalog for ebook reader apps	Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata
Requires a web server you set up and maintain Depends on Calibre for managing the library	Closed source Requires a Java runtime
Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	No account 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.