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Ubooquity vs Stump: catalog facts
Ubooquity	Stump
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	Handles comics, manga and ebooks OPDS support for third-party reader apps
Closed source Requires a Java runtime	Requires running your own server
Downloadable app, Self-hosted	Self-hosted
Closed source	Open source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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