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Koodo Reader vs Arianna: catalog facts
Koodo Reader	Arianna
Free Free and open source under the AGPL-3.0.	Free Free and open source under the GPL-3.0, supported by KDE.
Windows, macOS, Linux, Android, iOS, Web	Linux
Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud	Finds books on the computer automatically Sorts the library by category, genre and author
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	Reads EPUB files only Linux only
Downloadable app, Web application	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

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