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Atsumeru vs Ubooquity: catalog facts
Atsumeru	Ubooquity
Free Free and open source under the MIT licence.	Free Free to download and use.
Windows, Linux, Android, Web, Self-hosted	Windows, macOS, Linux, Self-hosted
Reads CBZ, CBR, CB7, PDF and DjVu files Two-way reading history sync between web and apps	Runs anywhere Java runs, including NAS devices Reads Calibre and ComicRack metadata
ePub and FB2 support is limited Smaller project with a modest community	Closed source Requires a Java runtime
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License: MIT	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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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