Learn vocabulary
as you browse
Transform your web browsing into a powerful vocabulary learning experience. Save words on Chrome, review on your iPhone. Learn effortlessly across all your devices.
Her eloquent speech moved the entire audience to tears.
eloquent
/ˈeləkwənt/
adjective: Fluent or persuasive in speaking or writing
Example: An eloquent speaker who can move audiences with words
Your Complete Learning Ecosystem
Save words from real contexts. Personalize with your own notes. Master through innovative practice methods—all synced across your devices.
Chrome Extension
- Instant word lookup on any website
- YouTube subtitle integration
- Context-aware saving
- 10+ language translations
iOS App
- Notification flashcards for micro-learning
- Interactive home screen widgets
- AI-generated podcasts for vocabulary review
- MCP integration for AI apps
Powerful Features for Effortless Learning
Everything you need to build your vocabulary naturally while browsing the web
YouTube Smart Learning
Click any word in YouTube subtitles. Video auto-pauses, instant definition appears. Learn from TED talks, courses, and videos effortlessly.
Personalized Learning Cards
Save words and customize them with your own definitions, example sentences, and notes. Create vocabulary cards that truly resonate with you.
Context-Aware Saving
Save words with their original context automatically preserved. Remember exactly where and how you encountered each word.
AI Podcast Generator
Select your words and we'll generate engaging conversational podcasts with natural male-female dialogue to help you review and master vocabulary.
MCP Integration
Connect Lockcard with MCP-enabled AI applications. Save words from AI tools or access your vocabulary within your favorite AI apps seamlessly.
Interactive Widgets
Practice vocabulary right from your home screen with interactive widgets. Multiple practice modes including notification flashcards for micro-learning.
Learn from YouTube Videos
Click any word in video subtitles for instant definitions. Video pauses automatically so you never lose your place.
Ready to experience all these features?
How It Works
Learning vocabulary has never been this simple. Just 4 steps to fluency.
Discover in Context
Encounter new words while watching YouTube videos, reading articles, or using AI applications. Learning from real content makes vocabulary stick.
Save & Personalize
Save words with one click, then add your own definitions, example sentences, and notes. Create vocabulary cards that truly resonate with you.
Sync to iPhone
Manually sync your vocabulary collection to your iPhone with a tap. Access your personalized word cards across both platforms.
Practice Innovatively
Review with notification flashcards during idle moments, practice via home screen widgets, or listen to AI-generated podcasts of your words.
Start Your Learning Journey Today
Install the Chrome extension and download the iOS app to get started
Loved by Language Learners
Join hundreds of students, professionals, and lifelong learners who are mastering English vocabulary effortlessly
"Lockcard has completely transformed how I learn English. The YouTube integration is brilliant - I can learn from my favorite TED talks without interruption!"
"As someone preparing for TOEFL, this is exactly what I needed. The context-aware saving helps me remember words in their natural usage. Highly recommended!"
"The AI podcast feature is genius! I listen to my vocabulary words during my commute. It's like having a personal language tutor."
"I've tried many vocabulary apps, but Lockcard is different. Learning while browsing feels so natural. My vocabulary has grown significantly!"
Read more reviews on the App Store
Frequently Asked Questions
Got questions? We've got answers. Can't find what you're looking for? Reach out to us!
No! One Premium subscription unlocks all features on both Chrome and iOS. Your free account also works across both platforms with limited features.
Download the iOS app and start your free trial. You'll get full access to all Premium features for 7 days. Cancel anytime before the trial ends and you won't be charged.
Absolutely. Your data is encrypted during transmission and storage. We only save the words you choose to save, and we never track your browsing habits. You have full control over your data.
We support 10+ languages including English, Chinese (Simplified), Spanish, Japanese, Korean, French, German, Portuguese, Russian, and more. You can choose your preferred translation language in settings.
The Chrome extension's basic lookup functionality works offline for previously searched words. The iOS app allows you to review your saved words offline. However, new word lookups and syncing require an internet connection.
When watching YouTube videos with subtitles, simply click any word in the subtitle. The video automatically pauses, and you get an instant definition. It's perfect for learning from educational content.
We're here to help! Contact us at bravetsia@gmail.com or shirlxfu@gmail.com. You can also reach us on Instagram @LockcardApp or WeChat: shirlxfu.
Still have questions?
Contact usReady to Build Your Vocabulary Effortlessly?
Join hundreds of learners who are mastering English vocabulary while doing what they already do online. Start your journey today — it's free to begin!