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Arianna vs Thorium Reader: catalog facts
Arianna	Thorium Reader
Free Free and open source under the GPL-3.0, supported by KDE.	Free The open-source software is available without a license fee. Hosting, hardware and…
Linux	Windows, macOS, Linux
Finds books on the computer automatically Sorts the library by category, genre and author	Supports library imports, bookmarks and adjustable reading layouts.
Reads EPUB files only Linux only	Format and protection support depend on the book being opened.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: BSD-3-Clause
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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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