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Koodo Reader vs Flow: catalog facts
Koodo Reader	Flow
Free Free and open source under the AGPL-3.0.	Free Free and open source; self-hosting costs only your own server.
Windows, macOS, Linux, Android, iOS, Web	Web, Self-hosted
Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud	Reads EPUB files directly in the browser Docker and docker-compose files for self-hosting
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	Focused on EPUB rather than a wide range of formats Self-hosting requires running a server
Downloadable app, Web application	Web application, Self-hosted
Open source	Open source
License: AGPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

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