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ッツ Ebook Reader vs EPUBReader: catalog facts
ッツ Ebook Reader	EPUBReader
Free Free to use, with the source code published on GitHub.	Free Free to install.
Web, Self-hosted	Browser extension
Works with Yomitan and similar dictionary extensions Runs in the browser with nothing to install	Works in Firefox, Chrome, Opera and Edge Opens books in place without copying them
Focused on Japanese reading rather than general ebook management Dictionary lookups depend on a separately installed browser extension	Does not open DRM-protected ebooks Read-aloud needs a separate extension
Web application, Self-hosted	Browser extension
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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