Learn languages while watching YouTube videos
LangKey is a browser extension that turns video subtitles into dictation, shadowing, cloze exercises, vocabulary review, and playback controls so watching becomes active practice.
Input Mode
Practice along while watching videos, which is more effective than just watching and listening, forming muscle memory.
Selection Mode
Shuffle sentence order and let you participate in sorting to understand grammatical structure.
Listening Mode
Just like traditional dictation, this will put your listening skills to the test.
Voice Mode
Repeat sentences and check your pronunciation, refuse to only know but not speak
Fill-in Mode
AI-customized fill-in-the-blank questions, simplifying unnecessary repetitive learning by only practicing your new vocabulary
Combine traditional listening, speaking, reading, and writing to upgrade old learning methods
Transform passive viewing into interactive experiences, enhancing engagement for better learning outcomes.
Full Keyboard Control
Designed for efficiency. No need to touch the mouse, complete all frequent operations like repeating, skipping sentences, and looking up words through keyboard shortcuts.
Multi-language Support
Whether it's English, Japanese, or any language supported by YouTube/Bilibili, you can learn through your favorite video content.
Instant Vocabulary Mastery
Click on words to view detailed definitions, listen to pronunciations, and add them to your favorites for later review with one click.
Transparency and Openness
Listen to community feedback and continuously evolve. We believe that a transparent development process can bring better product experiences to users.
Cross-device Real-time Sync
Your learning progress and vocabulary book will be synced in real-time across all browsers, allowing you to start learning anytime, anywhere.
Native Dark Mode Support
Perfectly adapts to dark themes, providing multi-language interface switching, making late-night study sessions no longer harsh on the eyes.
Ready to master a new language?
Join LangKey now and turn your YouTube and Bilibili browsing into an efficient language growth journey.