Compare software

Ubooquity vs COPS: catalog facts
Ubooquity	COPS
Free Free to download and use.	Free Free and open source.
Windows, macOS, Linux, Self-hosted	Web, Self-hosted
Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata	Works directly with an existing Calibre library OPDS catalog for ebook reader apps
Closed source Requires a Java runtime	Requires a web server you set up and maintain Depends on Calibre for managing the library
Downloadable app, Self-hosted	Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
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 September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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