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EPUBReader vs Thorium Reader: catalog facts
EPUBReader	Thorium Reader
Free Free to install.	Free The open-source software is available without a license fee. Hosting, hardware and…
Browser extension	Windows, macOS, Linux
Works in Firefox, Chrome, Opera and Edge Opens books in place without copying them	Supports library imports, bookmarks and adjustable reading layouts.
Does not open DRM-protected ebooks Read-aloud needs a separate extension	Format and protection support depend on the book being opened.
Browser extension	Downloadable app
Closed source	Open source
License not stated	License: BSD-3-Clause
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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