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Readlang vs Language Reactor

Readlang vs Language Reactor: text or video?

Readlang and Language Reactor get compared because both let you click a word you do not know and keep going. They do it in different places. Language Reactor is a desktop browser extension that lays two sets of subtitles over Netflix and YouTube; Readlang is a reader for text, with a YouTube transcript player on the side. This page sets them next to each other, adds our own iPhone app for the reading-on-the-phone case, and says plainly where each one stops. Readlang Mobile is an independent app, not connected to Readlang or to Language Reactor.

Download Readlang Mobile for iOS

Free to start. iPhone and iPad. Readlang Mobile is a separate app by an independent developer, not affiliated with Readlang.

The short answer

Different jobs. Language Reactor is for watching: dual subtitles, a popup dictionary and precise replay on Netflix and YouTube, inside desktop Chrome, free. Readlang is for reading: any text, any web page, more than a hundred languages, click a word, flashcards afterwards. Its YouTube player is a side feature, and it does not touch Netflix.

Many people use both, because a series in the evening and a book on the train do not compete for the same hour. If your input is mostly video, start with Language Reactor. If it is mostly text, start with Readlang. If the text is on an iPhone, see how Readlang runs on a phone and where a native reader such as Readlang Mobile fits.

Side by side

Three columns, because the question people actually have is usually a three-way one: video in the browser, text in the browser, or text on the phone. The Readlang column was checked on 14 September 2026 at readlang.com and the Readlang forum; the Language Reactor column against languagereactor.com and its Chrome Web Store listing in August 2026.

Readlang Language Reactor Readlang Mobile
Main job Reading text with click-to-translate Dual subtitles on Netflix and YouTube Reading books and articles on the phone with tap-to-translate
Platform Website; Chrome, Edge and Firefox extensions; a home-screen shortcut on phones Chrome extension on desktop, plus a web app in the browser; no iOS app Native iPhone and iPad app, iOS 18 or later; no Android
Netflix Not supported Yes; the core feature No
YouTube Import a video for a synchronized, clickable transcript Yes; dual subtitles and the popup dictionary No
Reading books and articles The main job: pasted text, DRM-free EPUB, the shared library, any web page through the extension Possible: text import into the browser reader The whole app: a library graded A1 to C1, articles by link, EPUB on Premium
Phrase translation 10 a day of up to 6 words free; unlimited up to 12 words on Premium The popup dictionary for words is free; machine translation is a Pro feature Tap the first and last word; up to 6 words free, longer on Premium
Flashcards Built in: spaced repetition, words ranked by frequency, CSV export Saving words is a Pro feature, with Anki export Words saved automatically; practice on Premium; no export
Free tier Unlimited single words; 10 phrases and 10 AI explanations a day Dual subtitles and the popup dictionary on Netflix and YouTube 30 translations a day with the whole library
Paid price $6 a month or $48 a year; Premium Plus $15 a month or $120 a year Pro; no pricing page we could verify, check inside the app $8.99 a month or $59.99 a year
Phone use The website added to the home screen; the Firefox extension on Android The web app in a mobile browser; no native app A native app; this is what it is for
Offline No No: it runs on streamed video and web pages, and translation runs on their servers Only with Apple Translate and a downloaded language pack; a book must be opened online once

Prices in USD. Readlang from readlang.com/pricing on 14 September 2026; Language Reactor Pro has no public pricing page we could verify, so confirm it in the app.

Readlang on YouTube and Netflix

Readlang can import a YouTube video. What you get is the video with its transcript alongside, synchronized to playback, and every word in the transcript clickable the same way as in a text. Words you click go to the same flashcard pile as everything else you read. For a learner who already lives in Readlang, that is a comfortable way to add listening without a second tool.

It is a side feature, and it shows. In 2026 the Readlang forum has complaints about imported transcripts arriving as one long paragraph, which makes following along harder than it should be. There are no dual subtitles and no controls built for video. It is a reader that happens to play a video, not a video player.

Netflix is not supported at all. There is no Readlang integration, extension or workaround for Netflix; searches for "readlang netflix" are almost always people looking for Language Reactor. If Netflix is your material, that decision is made for you.

Language Reactor for reading

Language Reactor is not only video. It can import text, including books and web pages, into a reader in the browser, with the same popup dictionary. On a laptop that covers part of what Readlang does, and if you already have it installed for Netflix it is worth trying before adding a second subscription.

Two limits, both from what we could verify. It is a browser tool: on a phone that means a tab in mobile Safari, not a reading app that keeps your place in a novel. And saving words is a Pro feature, so the read-then-review loop that is free on Readlang is paid on Language Reactor. We could not find a public pricing page for Pro; check inside the app. The Language Reactor alternative page goes through the reading side in more detail.

Which to pick by habit

Set the feature lists aside for a moment and look at the hour of the day when you actually learn.

Evenings with a series

Language Reactor. Dual subtitles over Netflix, a dictionary on click, precise replay with keyboard shortcuts. The free tier covers it, and around two million people use the Chrome extension. Nothing in Readlang competes with this.

The commute with a book or an article

Readlang, if the reading happens at a desk or in a desktop browser: the extension makes every site clickable, and the hundred-plus languages mean it will have yours. On a phone, Readlang is the website on the home screen, which works and feels like a website; the iPhone page is honest about that. A native reader is the other option, and the last section of this page is about one.

Both

The common case. Video on the laptop with Language Reactor, text with Readlang, and one review habit rather than two: review in whichever tool you use more and let the other be input. Readlang exports words to CSV and Language Reactor exports to Anki on Pro, so Anki is the place the two vocabularies can meet if you want a single deck. The Readlang vs LingQ page covers the other comparison people run before settling on a reader.

Where Readlang Mobile fits

Readlang Mobile is the reading half only, built for the phone. It is a native iOS app for iPhone and iPad: a library of public-domain books graded A1 to C1, some narrated with the current word highlighted; articles by pasting a link; your own EPUB on Premium. Tap a word and the translation appears in the text. By default, translation comes from Google Translate through the app's server; in Settings you can switch to Apple Translate, which runs on the device.

It has no video at all. No YouTube, no Netflix, no transcripts. It covers about twenty languages rather than a hundred, and it does not export words. If you were weighing Language Reactor, none of that replaces it; the app belongs in the same slot as Readlang, on the device where Readlang is a website. It is free for 30 translations a day, with Premium at $8.99 a month or $59.99 a year through the App Store. The download page explains what is and is not in the App Store under the Readlang name; the alternatives page lists the wider field.

Questions people ask

Does Readlang work with Netflix?

No. Readlang has no Netflix support of any kind. Its only video feature is a YouTube import with a synchronized transcript. Netflix with dual subtitles is what Language Reactor does.

Can Readlang import YouTube videos?

Yes. Import a video and Readlang shows it with a synchronized transcript in which every word is clickable; clicked words join your flashcards. It is a side feature: in 2026 forum users report transcripts arriving as one unbroken paragraph, and there are no dual subtitles.

Is Language Reactor free?

Yes, unusually so: dual subtitles and the popup dictionary on Netflix and YouTube cost nothing, and about two million people use the Chrome extension. Pro adds saving words and machine translation. Language Reactor publishes no pricing page we could verify, so check the price inside the app.

Can I use both Readlang and Language Reactor?

Yes, and it is the common arrangement: video with Language Reactor, text with Readlang. There is no link between them. Readlang exports words to CSV and Language Reactor exports to Anki on Pro, so Anki is where the two vocabularies can be merged if you want one deck.

Which is better for beginners?

It depends on whether the beginner is reading or listening. Reading lets you slow to your own pace and click every word, which Readlang and Readlang Mobile are built for; a library graded by level helps here, and Readlang Mobile has one where Readlang and Language Reactor leave you to find material at your level yourself. Listening with dual subtitles trains the ear on natural speech from the start, which Language Reactor does and the readers do not. Most beginners end up wanting both, so start with the one that matches what you would do anyway.

Does either work on an iPhone?

Neither has a native iPhone app. Readlang runs as its website added to the home screen, with a Safari bookmarklet for other sites; Language Reactor is a desktop Chrome extension plus a web app you can open in a mobile browser. Readlang Mobile is a native iOS reader for the text side; it has no video.

Pick by the hour, not by the feature list

A series with Language Reactor, a chapter with Readlang or Readlang Mobile. All three are free to try, and an evening with each will tell you more than any table.

Download Readlang Mobile for iOS

Free to start. iPhone and iPad. Readlang Mobile is a separate app by an independent developer, not affiliated with Readlang.