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Librum vs Koodo Reader: catalog facts
Librum	Koodo Reader
Free Free and open source.	Free Free and open source under the AGPL-3.0.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Web
Reader and library manager in one app Runs on several desktop platforms	Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud
Sync depends on the project's service Smaller project than established readers like Calibre	It reads DRM-free files only; books bought from a store with DRM will not open Sync depends on whatever storage you configure, so the setup is on you
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 20, 2026

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