ContextCat vs Language Reactor: shows or texts?
Language Reactor adds dual subtitles and a pop-up dictionary to Netflix and YouTube. ContextCat helps you read news, books and PDFs on iPhone. How they compare.
The short answer: Language Reactor is the best-known way to learn from Netflix and YouTube: it shows subtitles in two languages, lets you hover any word for a dictionary entry, and pauses after each line. ContextCat is for reading: news, books, your PDFs and articles on your iPhone, with each tapped word explained as it is used in that sentence, in your language. If you learn from shows, use Language Reactor. If you learn from text, or need to read a document, use ContextCat. Many learners do both.
ContextCat is our app. Facts about Language Reactor come from its website, Pro page and FAQ, checked on October 27, 2026.
At a glance
| Language Reactor | ContextCat | |
|---|---|---|
| Where it works | Desktop browser on Netflix and YouTube, plus its website | iPhone |
| What you learn from | Shows and videos, and texts in its web reader | News, books, PDFs, links and pasted text |
| Help on a word | Hover dictionary, dual subtitles | The meaning in this sentence, explained in your language |
| Listening | The show itself | AI voices read any text aloud with highlighting |
| Review | Saved words with export (Pro) | Spaced-repetition cards with the sentence |
| Price | Free core features; Pro is paid | Free plan; Pro $7.99/month or $49.99/year (US App Store) |
Where Language Reactor is the better choice
- You learn from Netflix and YouTube. Dual subtitles and line-by-line pausing are what it was made for.
- You want listening practice with real speech. A show gives you native voices, accents and speed that read-aloud cannot.
- You want a free start. The core subtitle and dictionary features cost nothing.
Where ContextCat is the better choice
- You learn from reading. Articles and books carry far more words per minute than dialogue, and you set the pace.
- You read on your phone. ContextCat is an iPhone app; Language Reactor is mainly a desktop extension.
- You have a document to get through. Import a PDF, ask questions about it and listen to it.
- You want the meaning that fits. A dictionary pop-up lists meanings; ContextCat explains the one this sentence uses.
Questions
Is Language Reactor free?
- Its core features are free: dual subtitles on Netflix and YouTube where an official translation exists, a pop-up dictionary and auto-pause. Pro, a paid plan, adds machine translations for more titles and saving words and phrases. See its Pro page for the current price.
Does Language Reactor work on a phone?
- It is mainly a desktop browser extension for Netflix and YouTube, with a website that also has a text reader. ContextCat is an iPhone app.