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EPUBReader vs Flow: catalog facts
EPUBReader	Flow
Free Free to install.	Free Free and open source; self-hosting costs only your own server.
Browser extension	Web, Self-hosted
Works in Firefox, Chrome, Opera and Edge Opens books in place without copying them	Reads EPUB files directly in the browser Docker and docker-compose files for self-hosting
Does not open DRM-protected ebooks Read-aloud needs a separate extension	Focused on EPUB rather than a wide range of formats Self-hosting requires running a server
Browser extension	Web application, Self-hosted
Closed source	Open source
License not stated	License not stated
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 October 1, 2026

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