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Thorium Reader vs Adobe Digital Editions: catalog facts
Thorium Reader	Adobe Digital Editions
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to download.
Windows, macOS, Linux	Windows, macOS, Android, iOS
Supports library imports, bookmarks and adjustable reading layouts.	EPUB 3 support including audio, video and right-to-left text Books appear across all devices with ADE
Format and protection support depend on the book being opened.	Closed source Reading features are basic compared with dedicated library managers
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License not stated
Not stated if an account is needed	Not stated if an account is 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 23, 2026

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