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Readlang vs Satori Reader: catalog facts
Readlang	Satori Reader
Freemium Free to start, with paid plans available.	Freemium Guest access is available; full content requires a paid plan listed on the pricing page.
Web, Browser extension	Web
Click-to-translate on any text or website Translated words saved automatically as flashcards	Annotated stories with grammar and kanji help Audio to listen alongside the text
Best suited to learners who can already read simple texts Some features require a paid plan	Japanese only Less suited to complete beginners
Web application, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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