Compare software

Thorium Reader vs Koodo Reader: catalog facts
Thorium Reader	Koodo Reader
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the AGPL-3.0.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Web
Supports library imports, bookmarks and adjustable reading layouts.	Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud
Format and protection support depend on the book being opened.	It reads DRM-free files only; books bought from a store with DRM will not open Sync depends on whatever storage you configure, so the setup is on you
Downloadable app	Downloadable app, Web application
Open source	Open source
License: BSD-3-Clause	License: AGPL-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 20, 2026

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