Butterfluent: Learn Languages with YouTube & Netflix

Tracking since Apr 2, 2026.

Changelog

• May 8, 2026
  permissions

  storage, alarms, tabs, scripting

  storage, alarms, tabs

• May 1, 2026
  permissions

  storage, alarms, tabs

  storage, alarms, tabs, scripting

• Apr 24, 2026
  description

  🚀 Understand German videos instantly (YouTube, Netflix & more)
  
  Butterfluent – Dual Subtitles & AI Language Learning for Streaming
  
  Turn your screen time into real language progress.
  
  Butterfluent is a powerful browser extension that adds dual subtitles, AI-powered translation, and interactive learning tools to platforms like Netflix, YouTube, Prime Video, and more. No switching apps. No friction. Just learn while you watch.
  
  🚀 Key Features
  1. 🎬 Dual Subtitles (Bilingual Mode)
  
  Watch with original + translated subtitles at the same time.
  
  Understand context instantly
  Compare sentence structure naturally
  Perfect for serious language learners
  2. ⚡ Instant AI Translation
  
  Click any word or sentence to get:
  
  Accurate translation
  Meaning in context (not robotic)
  Example usage
  
  No more guessing or pausing to Google things.
  
  3. 🧠 Smart Vocabulary System
  
  Don’t just watch—retain.
  
  Save words and phrases with one click
  Auto-generate flashcards
  Review later with spaced repetition
  
  If you’re not saving words, you’re wasting time. This fixes that.
  
  4. 🔁 Learning Modes That Actually Work
  Pause Mode → auto-pauses on new lines
  Repeat Mode → loop difficult sentences
  Speed Control → slow down without distortion
  
  You control the pace, not the video.
  
  5. 🎨 Full Subtitle Customization
  
  Make subtitles readable and comfortable:
  
  Font size, color, opacity
  Position on screen
  Background and blur
  
  Most tools do this halfway. This one gives full control.
  
  6. 📊 Progress Tracking
  
  See if you’re improving—or just pretending.
  
  Words learned
  Review stats
  Learning streaks
  
  Real feedback = real progress.
  
  7. 🌍 Works Across Platforms
  
  One tool. Multiple platforms.
  
  Netflix
  YouTube
  Prime Video
  Disney+
  More coming
  🎯 Why Butterfluent?
  
  Most subtitle tools do one thing decently.
  
  Butterfluent combines:
  
  Dual subtitles
  AI translation
  Vocabulary building
  Active learning modes
  
  into one system that actually helps you improve.
  
  If you're just watching passively, you won’t learn.
  Butterfluent forces active engagement—without ruining the experience.
  
  ⚡ Simple Setup
  Install extension
  Open your streaming platform
  Turn on subtitles
  Start learning instantly
  
  No complicated setup. No wasted time.
  
  🦋 Who Is This For?
  Language learners who are tired of slow progress
  Students preparing for exams (B2 → C1, etc.)
  Anyone watching foreign content regularly
  
  If you're already watching shows daily and not improving, you're doing it wrong. This fixes that.
  
  📩 Support
  
  Contact: [email protected]

  Turn streaming into a language classroom.
  
  Butterfluent adds real-time translated subtitles alongside the original—no tab switching, no copy-pasting. Click any word to get instant AI-powered explanations, grammar breakdowns, and example sentences. Save words and review them later with spaced repetition.
  
  🌍 SUPPORTED LANGUAGES
  German • French • Spanish • Italian • Portuguese • Dutch • Polish • Swedish • Japanese • Korean
  
  Works with subtitle-enabled videos on platforms like YouTube and Netflix, as well as other streaming sites.
  
  Designed for learners from A1 to B2 who want to improve German listening, vocabulary, and sentence structure using authentic media.
  
  ✨ CORE FEATURES
  
  🔤 Dual Subtitles
  View original and translated subtitles side by side, synced in real time.
  
  🔍 AI Word Lookup
  Click any word to see meaning, CEFR level, grammar, and contextual examples.
  
  🎴 Flashcards & Spaced Repetition
  Save words and review them efficiently using an SM-2 based system.
  
  📊 CEFR Highlighting
  Instantly gauge difficulty with color-coded vocabulary levels.
  
  🎛️ Smart Playback Controls
  Auto-pause, subtitle toggling, speed control, and comprehension mode.
  
  🔒 PRIVACY
  No tracking of viewing history. No data selling. Full control over your data.
  
  💡 IDEAL FOR
  Learners using real-world content to build vocabulary and comprehension.
  
  One tool. Multiple platforms.
  
  Netflix
  YouTube
  Prime Video
  Disney+
  More coming
  
  
  🚀 GET STARTED
  
  Install Butterfluent
  Open a video with subtitles
  Select your target language
  Start learning instantly
  
  Free plan includes word lookup, CEFR highlighting, and flashcard creation. Pro plan (€4.99/mo) removes all limits on subtitle translations, AI lookups, and flashcard generations.
  
  Questions? Visit butterfluentgerman.com or open an issue on our support page.
  
  
  📩 Support
  
  Contact: [email protected]

• Apr 24, 2026
  short_description

  Learn German on YouTube & Netflix with dual subtitles, instant word lookup, saved vocabulary, and review tools.

  Dual subtitles, CEFR word lookup & flashcards for German, French, Spanish, Italian, Japanese, Korean & more on YouTube & Netflix.

• Apr 24, 2026
  name

  Butterfluent: Learn German with YouTube, Netflix & Any Video

  Butterfluent: Learn Languages with YouTube & Netflix

• Apr 17, 2026
  description

  Turn real video into German study time.
  
  Butterfluent adds study tools to supported video sites so you can keep watching while learning. Read dual subtitles, click words for explanations, save vocabulary, and review what you learned on your Butterfluent account.
  
  What Butterfluent helps you do:
  - Show a translated support subtitle line while you watch
  - Click subtitle words for definitions, context, and phrase help
  - Save useful words to your account
  - Review saved vocabulary from the web dashboard
  - Use replay, stepping, loop, and study controls during playback
  
  Account features:
  - Sign in to sync saved words and review progress
  - Free and paid plans available
  - Usage limits and live review stats appear inside the extension popup and player
  
  How it works:
  1. Install the extension
  2. Open a supported video page with subtitles available
  3. Turn subtitles on in the player
  4. Use Butterfluent's overlay, word lookup, and review tools while you watch

  🚀 Understand German videos instantly (YouTube, Netflix & more)
  
  Butterfluent – Dual Subtitles & AI Language Learning for Streaming
  
  Turn your screen time into real language progress.
  
  Butterfluent is a powerful browser extension that adds dual subtitles, AI-powered translation, and interactive learning tools to platforms like Netflix, YouTube, Prime Video, and more. No switching apps. No friction. Just learn while you watch.
  
  🚀 Key Features
  1. 🎬 Dual Subtitles (Bilingual Mode)
  
  Watch with original + translated subtitles at the same time.
  
  Understand context instantly
  Compare sentence structure naturally
  Perfect for serious language learners
  2. ⚡ Instant AI Translation
  
  Click any word or sentence to get:
  
  Accurate translation
  Meaning in context (not robotic)
  Example usage
  
  No more guessing or pausing to Google things.
  
  3. 🧠 Smart Vocabulary System
  
  Don’t just watch—retain.
  
  Save words and phrases with one click
  Auto-generate flashcards
  Review later with spaced repetition
  
  If you’re not saving words, you’re wasting time. This fixes that.
  
  4. 🔁 Learning Modes That Actually Work
  Pause Mode → auto-pauses on new lines
  Repeat Mode → loop difficult sentences
  Speed Control → slow down without distortion
  
  You control the pace, not the video.
  
  5. 🎨 Full Subtitle Customization
  
  Make subtitles readable and comfortable:
  
  Font size, color, opacity
  Position on screen
  Background and blur
  
  Most tools do this halfway. This one gives full control.
  
  6. 📊 Progress Tracking
  
  See if you’re improving—or just pretending.
  
  Words learned
  Review stats
  Learning streaks
  
  Real feedback = real progress.
  
  7. 🌍 Works Across Platforms
  
  One tool. Multiple platforms.
  
  Netflix
  YouTube
  Prime Video
  Disney+
  More coming
  🎯 Why Butterfluent?
  
  Most subtitle tools do one thing decently.
  
  Butterfluent combines:
  
  Dual subtitles
  AI translation
  Vocabulary building
  Active learning modes
  
  into one system that actually helps you improve.
  
  If you're just watching passively, you won’t learn.
  Butterfluent forces active engagement—without ruining the experience.
  
  ⚡ Simple Setup
  Install extension
  Open your streaming platform
  Turn on subtitles
  Start learning instantly
  
  No complicated setup. No wasted time.
  
  🦋 Who Is This For?
  Language learners who are tired of slow progress
  Students preparing for exams (B2 → C1, etc.)
  Anyone watching foreign content regularly
  
  If you're already watching shows daily and not improving, you're doing it wrong. This fixes that.
  
  📩 Support
  
  Contact: [email protected]

• Apr 17, 2026
  short_description

  Learn German from real video with dual subtitles, instant word lookup, saved vocabulary, and review tools.

  Learn German on YouTube & Netflix with dual subtitles, instant word lookup, saved vocabulary, and review tools.

• Apr 17, 2026
  name

  Butterfluent - Learn German While Watching

  Butterfluent: Learn German with YouTube, Netflix & Any Video

Permissions & access

Permissions

storagealarmstabs

Host access

https://www.youtube.com/*, https://www.netflix.com/*, https://www.disneyplus.com/*, https://www.primevideo.com/*, https://www.hulu.com/*, https://www.hbomax.com/*, https://play.max.com/*, https://www.crunchyroll.com/*, https://butterfluentgerman.com/*

Screenshots