Lockcard - Vocabulary Builder

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/