Lockcard - Vocabulary Builder

Learn vocab from YouTube, articles & PDFs. Save with context, track encounters, and sync to iPhone for review.

✨ WHY CHOOSE LOCKCARD? 🌐 LEARN VOCABULARY AS YOU BROWSE • Works across the web: news sites, blogs, newsletters, research papers, and more • Example sites: YouTube, BBC Learning English, The Economist, The New Yorker, NYT, and many others (not affiliated) • Learn naturally during your normal browsing — no separate “study time” required 🎬 YOUTUBE INTEGRATION • Click any word in YouTube subtitles to learn while watching • Learn from TED talks, courses, educational videos, and more • Save words with video context and timestamps for easy reference • Seamlessly integrate vocabulary learning into your video watching routine 📄 PDF SUPPORT • Select words directly in PDF files • Custom PDF viewer with seamless word selection • Learn from research papers, ebooks, and documents effortlessly 💾 CONTEXT-AWARE SAVING • Save words with their original context automatically preserved • Remember exactly where and how you encountered each word • Learn from real contexts, not isolated word lists • Smart duplicate detection with context merging • Organized by articles and videos you've read/watched 🔁 ENCOUNTER TRACKING • See how many times you’ve met a word across different pages/videos • Keep multiple real-world contexts for the same word (not just one definition) • Build a personal “where I learned this” history ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 💡 HOW IT WORKS: 1. Browse normally - read articles, watch YouTube videos, surf the web 2. Discover in context - encounter new words in real content, not word lists 3. Save with context - one-click save preserves where and how you learned each word 4. Sync to iPhone - your vocabulary collection syncs seamlessly across devices 5. Practice innovatively - review with notification cards, widgets, and AI podcasts on iOS