Lockcard - Vocabulary Builder from YouTube, Articles & AI

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

Users10K

Rating5.0

Reviews10

Manifest versionV3

7-day growth0

7-day growth rate0%

Preview

Lockcard - Vocabulary Builder from YouTube, Articles & AI Media preview

6 assets

Trend

30-day user trend

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User Growth Over Time

Rating trend

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30-day rating change

Start

5.00

Latest

5.00

30-day rating change

0.00

2026年5月29日2026年6月4日

Growth overview

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Technical snapshot

Version, languages, and crawl freshness

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Version1.9.1

ManifestV3

Size5.39MiB

Languages1English (United States)

Published--

Store updated--

Last crawled--

Overview

Product summary

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✨ 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

Reviews

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The Chrome Web Store shows 10 reviews, but only 0 review bodies have synced into ExtScope so far. Showing the synced reviews available right now.

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AI product read

Vocabulary builder extension that helps users learn English by saving words with context from YouTube, articles, PDFs, and web pages

Traditional vocabulary learning uses isolated word lists disconnected from real usage. This extension lets users capture vocabulary in context from actual content they consume, making it easier to understand how words are used in real situations.

User browses web/YouTube/PDFs → selects unfamiliar words → extension captures word with sentence context → words stored locally and synced to Supabase cloud → user reviews vocabulary list with spaced repetition → sync to iPhone for continuous learning

Target users: Multilingual learners studying English / Students preparing for exams / Professionals learning English for work / Anyone building vocabulary from real English content

Supabase configuration (SUPABASE_URL, SUPABASE_ANON_KEY) are empty strings in bundled code, suggesting these are injected at runtime or build time - actual auth flow behavior unclear
wordList.bundle.js (2.3MB) was not fully analyzed due to size
Cannot confirm whether login blocks all features or only cloud sync

Monetization

No paid features detected

No payment-related code found in extension source. No matches for 'stripe', 'premium', 'subscription', or 'upgrade' in extension bundles. The 'pro' keyword matches were false positives from PDF.js library (CSS selectors like #user-profile, protocol, property). No billing UI or payment API integration detected.

Confidence: 80
Payment platform: --
Source: AI / Medium
Login required: Yes
Reason: The extension integrates Supabase for authentication and cloud data sync. CSS in wordList.css contains login-button, login-form, and signup-form UI elements. The SupabaseWordRepository requires user_id for word operations (line in dist/697.bundle.js: 'user_id' validation). Auth state changes are tracked via onAuthStateChange listener. Login is needed for the cloud sync feature to save/sync vocabulary to iPhone, but basic local word saving may work without login.

Permission risk

High-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage、tabs、webRequest
主机权限覆盖范围较宽
同时具备浏览数据与站点访问能力

Publisher

Yongfeng Chai

Independent publisher

Email: [email protected]
Phone: --
Address: --

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