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EPUBReader vs Koodo Reader: catalog facts
EPUBReader	Koodo Reader
Free Free to install.	Free Free and open source under the AGPL-3.0.
Browser extension	Windows, macOS, Linux, Android, iOS, Web
Works in Firefox, Chrome, Opera and Edge Opens books in place without copying them	Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud
Does not open DRM-protected ebooks Read-aloud needs a separate extension	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
Browser extension	Downloadable app, Web application
Closed source	Open source
License not stated	License: AGPL-3.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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