Vocabulary Builder by Lockcard
Learn words in context & AI
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Lockcard is a vocabulary builder that helps you learn words in context across languages from real content such as YouTube videos, articles, PDFs, and any web pages you read or watch.
Instead of memorizing isolated word lists or using traditional flashcards alone, Lockcard lets you build vocabulary from real-world context and turn everyday content into long-term memory.
CAPTURE FROM REAL CONTENT
Turn what you read and watch into learning material.
• Save vocabulary from YouTube, articles, PDFs, and web pages
• Highlight words with full sentence context and source link
• One-click capture from any browsing or learning environment
• Sync all saved words automatically to your mobile app
LEARN IN CONTEXT
Understand how words are actually used.
• Keep original sentences and real usage context
• Track where and how you encountered each word
• Build vocabulary from real-world exposure, not dictionary definitions
• Strengthen understanding through repeated encounters
PERSONALIZED LEARNING SYSTEM
Turn vocabulary into long-term memory.
• Flashcards (fill-in, flip, multiple choice)
• Spaced repetition via notifications and widgets
• Passive learning through word podcasts
• Lightweight daily review built into your routine
AI VOCABULARY TUTOR
Learn words in a personalized way.
• AI explanations tailored to your learning profile
• Chat with AI about specific words and usage
• Generate personalized examples and explanations
• Learn vocabulary through interaction, not memorization
BUILT FOR REAL LEARNERS
Lockcard connects real content with real learning.
It transforms everyday exposure into a personalized vocabulary system—helping you move from encountering words to actually using them.
What our users say about Lockcard:
"Ya'll are amazing. Ever since I started using Lockcard, it's become something I use daily" — James (15y high school student)
"Super helpful especially with my busy schedule" — Peng (International Uni student)
"The simplicity and beautiful designs make it such a delight to use" — Charlotte (works @Duolingo)
"One of the most impressive apps I've used in a long time!" — Jordan
By downloading this app, you agree to Apple’s standard End User License Agreement https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
New Features
1. Word Journey
[Learning Timeline]: Every saved word now has its own Journey. See where it came from, when it was saved, what notes were added, and how it has been reviewed.
2. Translation Controls
[Show or Hide Translations]: New translation controls let you choose whether translations appear on word detail pages.
The developer, xinyi fu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Search History
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- xinyi fu
- Size
- 119 MB
- Category
- Education
- Compatibility
Requires iOS 15.5 or later.
- iPhone
Requires iOS 15.5 or later. - iPod touch
Requires iOS 15.5 or later. - Mac
Requires macOS 12.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- 按月订阅 $5.99
- 按年订阅 $39.99
- 按季度订阅 $14.99
- 终身会员 $79.99
- 终身会员 $149.00
- Monthly $7.49
- Yearly $61.99
- Quarterly $19.99
- Copyright
- © Lockcard