Butterfluent: Learn Languages with YouTube & Netflix

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

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: johanshello@gmail.com