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Readest vs FBReader: catalog facts
Readest	FBReader
Freemium The app is free and open source under the AGPL. The optional cloud sync service has paid…	Freemium The reader is free. Some format plugins and premium features are paid.
Windows, macOS, Linux, Android, Web, iOS	Windows, macOS, Linux, Android, iOS
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	Same library and reading position across desktop and mobile Reads custom OPDS catalogues as well as local files
Cloud sync is a hosted service with paid tiers, not purely local A young project, so features and stability are still moving	Some features and formats need paid add-ons The desktop builds lag the mobile apps
Downloadable app, Web application	Downloadable app
Open source	Closed 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 21, 2026	Official website Full listing and sources Checked September 22, 2026

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