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