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ッツ Ebook Reader vs Flow: catalog facts
ッツ Ebook Reader	Flow
Free Free to use, with the source code published on GitHub.	Free Free and open source; self-hosting costs only your own server.
Web, Self-hosted	Web, Self-hosted
Works with Yomitan and similar dictionary extensions Runs in the browser with nothing to install	Reads EPUB files directly in the browser Docker and docker-compose files for self-hosting
Focused on Japanese reading rather than general ebook management Dictionary lookups depend on a separately installed browser extension	Focused on EPUB rather than a wide range of formats Self-hosting requires running a server
Web application, Self-hosted	Web application, Self-hosted
Open 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 October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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