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Language Reactor vs Readlang: catalog facts
Language Reactor	Readlang
Freemium Free to use, with additional features in a paid tier.	Freemium Free to start, with paid plans available.
Browser extension	Web, Browser extension
Dual subtitles on Netflix and YouTube Uses real native material instead of textbook content	Click-to-translate on any text or website Translated words saved automatically as flashcards
Depends on third-party streaming sites that can change their players Proprietary	Best suited to learners who can already read simple texts Some features require a paid plan
Browser extension	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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