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Kavita vs Ubooquity: catalog facts
Kavita	Ubooquity
Freemium The server is free and open source. An optional Kavita+ subscription adds external…	Free Free to download and use.
Windows, macOS, Linux, Self-hosted, Web	Windows, macOS, Linux, Self-hosted
Purpose-built readers for EPUB, PDF and image-based comics, including webtoon mode Multi-user with per-library and age restrictions, through built-in logins or OIDC	Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata
You have to run and maintain a server, and expose it safely if you want remote access Some metadata enrichment is only available through the paid Kavita+ add-on	Closed source Requires a Java runtime
Self-hosted, Web application	Downloadable app, Self-hosted
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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