Language Reactor

On Netflix and YouTube, Language Reactor adds dual subtitles and study tools to the videos you already watch.

It is a language learning toolbox that works with native materials, including books and websites, and uses AI to personalize what you study.

The aim is to learn from real content rather than made-up textbook dialogue.

The tools cover comprehension and vocabulary: you get help understanding lines as they play and building a word list from what you meet.

Language Reactor also works on mobile and tablets, though the Netflix browser extension is desktop only and needs the Chrome extension installed.

Some features sit behind Pro mode, so the free version will not give you everything.

A catch worth knowing: the content itself still has to be watchable.

Certain shows or videos may require a Netflix or YouTube subscription.

If you learn by watching, this is a practical way to turn that habit into study time.