Language Reactor

Language Reactor shows two subtitle tracks at once, one in your target language and one in your native language. Seeing both lets you connect meaning to sound instead of guessing from context alone. You can move the tracks, resize them, or hide one when you want to challenge yourself and listen unaided.

Click any word in a subtitle and a panel appears with its translation, part of speech, and example sentences with audio. The Lexa AI dictionary goes further and explains how a word behaves in context, which helps with languages where a single term shifts meaning by grammar. The free helper answers basic questions, and Pro unlocks a more capable model.

You can slow the audio, pause on a single subtitle, and set the player to auto-pause after every line. Keyboard shortcuts and gestures handle rewind, forward, and repeat, so you rarely reach for the mouse. The controls matter most when a line comes too fast, since you can loop it until it's clear.

Save a word once and Language Reactor recognizes its other forms, including plurals and verb conjugations, wherever they appear. This turns scattered lookups into a running list of what you actually struggle with. You can practice saved items in PhrasePump or send them to Anki as flashcards with screenshots and audio clips.

The extension adds its layer directly onto the Netflix and YouTube players, so there's no separate app to learn. On Netflix it handles dubbed audio by generating subtitles from the speech track, a feature reserved for Pro. On YouTube it works across the site's channels and also adds a subtitle list view for jumping between lines.

Outside video, you can import a web page or upload a book, and Language Reactor adds a machine translation in your language and reads the text aloud with text-to-speech. That extends the same study loop to articles and novels, where there's no subtitle track to lean on.

PhrasePump is a listening exercise built from sentences you can mostly understand. It leans on words you've saved that are due for review and slips in new vocabulary at the edges. It's a way to move from passive watching to active recall without building your own drill list.