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Readest vs Arianna: catalog facts
Readest	Arianna
Freemium The app is free and open source under the AGPL. The optional cloud sync service has paid…	Free Free and open source under the GPL-3.0, supported by KDE.
Windows, macOS, Linux, Android, Web, iOS	Linux
Reads EPUB, PDF, MOBI, AZW3, FB2, CBZ, TXT and Markdown in one app The same reader on macOS, Windows, Linux, Android, iOS and the web	Finds books on the computer automatically Sorts the library by category, genre and author
Cloud sync is a hosted service with paid tiers, not purely local A young project, so features and stability are still moving	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 21, 2026	Official website Full listing and sources Checked September 24, 2026

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