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Ubooquity vs Calibre-Web: catalog facts
Ubooquity	Calibre-Web
Free Free to download and use.	Free Free to use, with source code published on GitHub.
Windows, macOS, Linux, Self-hosted	Web, Self-hosted
Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata	Uses an existing Calibre database directly Read books in the browser or download them
Closed source Requires a Java runtime	Depends on a library created with Calibre Requires running a server
Downloadable app, Self-hosted	Self-hosted
Closed source	Closed source
License not stated	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 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.