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About Lockcard
What is Lockcard?
Lockcard is a vocabulary app for English learners that turns passive word knowledge into active fluency. Instead of memorizing random lists, you save words from YouTube subtitles, web articles, and your own notes — with the original context preserved.
The problem it solves
Most language apps teach vocabulary in isolation, making it hard to recall words in real conversations. Lockcard solves that by capturing words from the content you already consume. When you encounter an unfamiliar word, click it — the video pauses, a definition appears, and the word is saved with its full sentence context.
Who it is for
Lockcard is for intermediate to advanced English learners (especially those learning from English-to-Chinese) who want to move beyond flashcards and build vocabulary naturally. It is not ideal for absolute beginners who need structured grammar lessons.
Real use cases
A learner watching a TED Talk on YouTube can click any word in the subtitles — the video pauses, the definition shows, and the word is saved alongside the exact subtitle sentence. Later, they practice via AI-generated podcasts, notification flashcards, or home screen widgets. Users can also customize explanations by setting their level, goal, age group, and profession so AI answers match personal needs.
Key features
- YouTube subtitle integration — Click any word in video subtitles; video auto-pauses and shows instant definition.
- Context-aware saving — Save words with original sentence context from articles, videos, or personal notes.
- AI Tutor for every word — Ask follow-up questions, get simple explanations, examples, and word comparisons.
- Multi-language support — Learn in 10+ languages with explanations in your chosen language (e.g., English → Chinese).
- Interactive home screen widgets — Practice vocabulary from your home screen with multiple practice modes.
- Notification flashcards — Micro-learning through spaced-repetition notifications on iOS.
- Cloud sync — Vocabulary, notes, and progress sync instantly across Chrome extension and iOS app.
