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Foliate vs Librum: catalog facts
Foliate	Librum
Free Free and open source, with no paid edition.	Free Free and open source.
Linux	Windows, macOS, Linux
Opens EPUB, Mobipocket, Kindle, FB2, CBZ and PDF Annotations and progress are plain JSON files you can sync however you want	Reader and library manager in one app Runs on several desktop platforms
Linux only; there is no Windows or macOS build Needs recent GTK4, libadwaita and WebKitGTK, which older distributions may not have	Sync depends on the project's service Smaller project than established readers like Calibre
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is 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 October 2, 2026

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