About Language Reactor
Language Reactor is the best-known tool for learning from streaming video. It was previously called Language Learning with Netflix. On Netflix it shows two subtitle tracks at once, one in the language you are learning and one in your own, and a click on any word opens a pop-up dictionary. It also works on YouTube, and you can paste in text or books to get a machine translation and spoken audio.
It is built for study rather than casual viewing, with precise playback controls on Netflix. The extension can be used for free and the listing shows in-app purchases, while the developer's forum describes a paid Pro mode. You still need your own Netflix subscription.
Read the small print first. The code is closed. Its privacy policy says it collects an anonymous browser ID, your Chrome account email, your Netflix country and language and subtitle counts, and shares none of it with third parties, but it names no company and still uses the old product name. In February 2026 its forum said no official Firefox version had been released, so a Firefox add-on carrying its name looks unofficial. Install it only from the Chrome Web Store.
Pros and cons
- Dual-language subtitles and a pop-up dictionary on Netflix and YouTube
- Precise playback controls built for studying
- Can also read imported text aloud with a machine translation
- Updated recently, with about two million Chrome users
- Closed source, and the operator is not named in its privacy policy
- No official Firefox version, and an unofficial add-on exists
- Mixed ratings, and some features need a paid Pro mode
Permissions
It runs on Netflix, YouTube and Amazon pages to read and display subtitles. Its privacy policy says it also sends an anonymous browser ID, your Chrome account email, Netflix country and language, and usage counts to its server.
