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COPS vs Stump: catalog facts
COPS	Stump
Free Free and open source.	Free Free and open source.
Web, Self-hosted	Web, Self-hosted
Works directly with an existing Calibre library OPDS catalog for ebook reader apps	Handles comics, manga and ebooks OPDS support for third-party reader apps
Requires a web server you set up and maintain Depends on Calibre for managing the library	Requires running your own server
Self-hosted	Self-hosted
Open source	Open 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.