Linglass — Dual Subtitles for YouTube & Netflix

Learn languages on YouTube, Netflix, Viki & iQIYI. Dual subtitles, click any word to translate, save words as flashcards.

Linglass shows dual subtitles on YouTube, Netflix, iQIYI and Viki, translates words and phrases in context, and turns them into flashcards with spaced repetition. Learning a new language doesn't have to feel like studying. Linglass helps you pick up vocabulary naturally — from the videos you already watch and the pages you already read. 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 Where You Watch - Two lines at once: the original and your own language, one above the other — bilingual reading, no pausing to look things up - Works on YouTube, Netflix, iQIYI (iq.com) and Viki (viki.com) - Built for what people actually watch: Korean and Chinese dramas, anime, films and series, interviews, vlogs and video essays - Click any word for an instant translation that fits the scene, or select a phrase for a full one - Save a word straight from what you're watching — the sentence, its translation and the frame are attached to the card - Font size, position and appearance are yours to adjust; one switch turns the whole overlay off - On Netflix, cover art and scene context are attached automatically to everything you save ✨ AI Subtitles for Videos Without Captions - YouTube videos with no captions at all: Linglass transcribes the audio with AI and translates that transcript into your language - Smart segmentation breaks speech into readable lines instead of word-by-word fragments — auto-generated captions become something you can actually read - Netflix: when a title has nothing in the language you are learning, an available track is translated into it for you - Free every month, with a monthly allowance; Premium removes the limit 🔍 Contextual Translation - Click a word — a popup dictionary opens over the video with the meaning it has in this sentence, not a generic entry - Select a phrase for an accurate multi-word reading - Phonetic transcription and native pronunciation audio - Save anything you look up to your vocabulary with one click - Works in the YouTube player and on any webpage 🤖 AI Grammar Explanation - Select any sentence — in a video or on a webpage — and get a structured grammar breakdown - See which constructions are used, with a CEFR / JLPT / HSK / TOPIK level label so you know what's worth learning next - Understand the role of each part of the sentence in your native language - Built into the same popup — no need to switch contexts 🎯 Video Catalog — Videos at Your Level - A curated catalog of videos, scored for difficulty and sorted onto Beginner, Intermediate and Advanced shelves - Every entry shows its vocabulary demand — CEFR for European languages, JLPT for Japanese, HSK for Chinese, TOPIK for Korean - Shelves for everyday conversation, channels made for learners, science, food, travel, gaming and more - Everything is checked to have working captions before it appears - Available for nine of the ten languages you can learn 🧠 Smart Flashcards with FSRS - Spaced repetition adapts to your memory - Review with real context — the sentence, its translation, and the frame it came from - Track your learning progress and streaks 🌐 Translate Anywhere on the Web - Select any word on any website to look it up instantly - Wikipedia, news, blogs, articles — learn while browsing - The same contextual reading you get over a YouTube video ⚖️ Comparison with Other Extensions How Linglass compares to popular subtitle extensions: * Language Reactor (a.k.a. "Language Learning with Netflix"): Offers dual subtitles with a click-to-translate dictionary and Anki export for saved words. Linglass matches that and adds per-word pronunciation audio, phonetic transcription, and built-in spaced repetition — no Anki setup required. * Trancy: Supports bilingual captions on many video platforms, plus GPT-based grammar analysis and a mobile app. Linglass covers fewer sites than Trancy and goes deeper on each: a free tier with built-in flashcards, contextual translation, AI grammar explanations, and a clean, distraction-free reading surface. * Migaku: Known for deep Anki integration and strong support for Japanese learners, with a paid subscription and a mobile app. Linglass takes a simpler path — cards are built in, there is a free tier, and the same toolset works across 10 languages. * Lingopie: A streaming service with its own content library and bilingual captions. Linglass is a browser extension you bring to the shows you already watch — no separate subscription, no platform lock-in. If you've tried Language Reactor, Trancy, Migaku, or Lingopie and want a lighter, more focused alternative — Linglass gives you the complete loop: watch, translate, save, review, plus AI grammar explanations. 🌍 Languages You can learn 10 languages with Linglass, and read the translation in any of 22 native languages. The 12 additional ones are translation targets only — not yet available as languages to learn. The current list is on our website: https://linglass.app 💬 Contact Us - Website: https://linglass.app - Support: support@linglass.app