Linglass — Learn Languages with Videos

YouTube subtitle translator with vocabulary flashcards. Instant contextual translation anywhere and spaced repetition.

Linglass provides dual subtitles on YouTube, contextual translation for words and phrases, and smart flashcards with spaced repetition. Learning a new language doesn't have to feel like studying. Linglass helps you pick up vocabulary naturally — by watching your favorite YouTube videos and browsing websites you already visit. Click any word to see its meaning in context, save it with one tap, and review it later with intelligent flashcards. The more you watch, the more you learn. 📺 Dual Subtitles on YouTube - Original and translated subtitles displayed simultaneously - Click any word in subtitles for instant translation - Select phrases for contextual translation - Adjust subtitle font size and position 🔍 Contextual Translation - Click any word — get meaning based on context, not just a dictionary entry - Select phrases for accurate multi-word translation - Phonetic transcription and native pronunciation - Save words and phrases to vocabulary with one click - Works in subtitles and on any webpage 🧠 Smart Flashcards with FSRS - Spaced repetition adapts to your memory - Review with real video context — sentence, translation, and frame - Track your learning progress and streaks 🌐 Translate Anywhere on the Web - Select any word on any website for instant translation - Wikipedia, news, blogs, articles — learn while browsing - Same contextual translation as in YouTube subtitles 🌍 Supported Languages English, German, French, Spanish, Italian, Portuguese, Japanese, Korean, Chinese, Russian, Thai, Vietnamese, Indonesian, and more. Free to use with daily limits. Premium removes all restrictions. 💬 Contact Us - Website: https://linglass.app - Support: support@linglass.app