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

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