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Readest vs Kindle for Web: catalog facts
Readest	Kindle for Web
Freemium The app is free and open source under the AGPL. The optional cloud sync service has paid…	Free The reader is free; books are bought or borrowed through Amazon.
Windows, macOS, Linux, Android, Web, iOS	Web
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	Nothing to install Highlights, notes and in-book search
Cloud sync is a hosted service with paid tiers, not purely local A young project, so features and stability are still moving	Requires an Amazon account Only reads content from your Amazon Kindle library
Downloadable app, Web application	Web application
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	Account 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 23, 2026

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