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Ubooquity vs Atsumeru: catalog facts
Ubooquity	Atsumeru
Free Free to download and use.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Self-hosted	Windows, Linux, Android, Web, Self-hosted
Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata	Reads CBZ, CBR, CB7, PDF and DjVu files Two-way reading history sync between web and apps
Closed source Requires a Java runtime	ePub and FB2 support is limited Smaller project with a modest community
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License: MIT
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 October 2, 2026

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