Comprehensible Input

App profile

Language Reactor

Language-learning toolkit for understanding and studying native media, especially Netflix, YouTube, podcasts, books, and webpages.

Visit official websiteFacts last verified August 24, 2026

Best for

  • Youtube
  • Netflix
  • Video Learning
  • Native Media

Pricing

Free plan
✓Supported
Monthly
$5.95/month
Annual
$39.95/year
  • Some features require Pro.

Availability

Platforms

Web✓Supported
iOS—Unsupported
Android—Unsupported
Browser extension✓Supported
Self-hosted / local—Unsupported

Factual overview

Feature summary

Browse Language Reactor’s capabilities by category, or compare the same fields across every researched app.

Content & discovery

Built-in content library
✓Supported
Content discovery
✓Supported
News & articles
—Unsupported
Books
✓Supported
YouTube / video library
✓Supported
Podcast library & discovery
✓Supported
Import own content
✓Supported
Import webpages
✓Supported

Reading & books

EPUB import
—Unsupported
Dedicated book reader
—Unsupported
Preserves original book structure
—Unsupported
Preserves chapters
—Unsupported
Preserves formatting
—Unsupported
Preserves images
—Unsupported
Text reading mode
Paginated
Book reading mode
Paginated
Book navigation / TOC
—Unsupported
Reading-position sync
✓Supported
TTS / read aloud
✓Supported

Video & audio

YouTube dual subtitles
✓Supported
Netflix dual subtitles
✓Supported
Audio import
✓Supported
Automatic transcription
✓Supported
Synchronized transcript / highlighting
✓Supported

Translation & comprehension

Word translation
✓Supported
Context-aware word translation
✓Supported
Sentence translation
✓Supported
Multiple dictionaries
✓Supported
AI explanations
✓Supported
Text simplification
—Unsupported
Base-form / lemma lookup
✓Supported

Vocabulary & review

Save words
✓Supported
Learning / known status
✓Supported
Separate meanings per word
—Unsupported
Seen / encounter count
—Unsupported
Example sentences
✓Supported
SRS flashcards
✓Supported
Multiple / custom decks
—Unsupported
Vocabulary import
—Unsupported
Export saved words
✓Supported
Export seen words
—Unsupported
Export examples / metadata
✓Supported

Learning & guidance

Structured courses / lessons
Limited
Grammar roadmap
—Unsupported
AI tutor
✓Supported
Human tutors
—Unsupported
Speaking practice
✓Supported
Writing practice
✓Supported
Pronunciation practice
—Unsupported

Progress & motivation

Daily streak
✓Supported
Daily goal
—Unsupported
Learner level
—Unsupported
Reading statistics
—Unsupported
Listening statistics
—Unsupported
Achievements
—Unsupported
Leaderboards
—Unsupported

Compare Language Reactor with other apps

Context matters

Notes behind the cells

Concise cells make scanning easy. These notes preserve the important caveats from each app record.

Language Reactor

  • The video experience includes interactive captions, transcript view, subtitle navigation, and vocabulary saving from video.
  • Reading audio and TTS read-aloud are available.
  • Vocabulary is tracked automatically, and TTS is available for words and examples.
  • Saved vocabulary and associated examples and metadata can be exported, including to Anki.
  • Community decks, AI-generated word forms, examples and images, and Duolingo vocabulary import are not supported.
  • Manual lesson building, AI lesson creation, and generating lessons from content are not supported.
  • The browser extension supports webpage import, YouTube dual captions, and Netflix integration.
  • Topic-based video categories are not available.

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Alternatives to Language Reactor

DuoNinjaComprehensible-input platform combining real-world content with vocabulary review, book reading, video learning, and structured lessons.