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Ubooquity vs Kavita: catalog facts
Ubooquity	Kavita
Free Free to download and use.	Freemium The server is free and open source. An optional Kavita+ subscription adds external…
Windows, macOS, Linux, Self-hosted	Windows, macOS, Linux, Self-hosted, Web
Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata	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
Closed source Requires a Java runtime	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
Downloadable app, Self-hosted	Self-hosted, Web application
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	Account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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