Compare software

Thorium Reader vs EPUBReader: catalog facts
Thorium Reader	EPUBReader
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to install.
Windows, macOS, Linux	Browser extension
Supports library imports, bookmarks and adjustable reading layouts.	Works in Firefox, Chrome, Opera and Edge Opens books in place without copying them
Format and protection support depend on the book being opened.	Does not open DRM-protected ebooks Read-aloud needs a separate extension
Downloadable app	Browser extension
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.