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System Tools

Marketing segmentation and disaster recovery utilities.

Marketing Segmentation

Query the user base to extract email lists for targeted campaigns.

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Paddle Reconciliation

Disaster recovery tool. If the database is restored from a backup, paste active Paddle Subscription IDs here to sync their state from Paddle back into our system.

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Unlock offline downloads, full access to all series, and support new development.

  • ✓ Download lessons for offline study
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Install in Two Steps

Add UseYu to your home screen for a full-screen experience, faster loading, and robust offline access.

1. Tap the Share icon
2. Then, select 'Add to Home Screen'
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Language & Script Guide

What is Mandarin?

Mandarin is the official language of Mainland China and Taiwan, and one of the official languages of Singapore. It is the most widely spoken Chinese dialect globally.

What is Cantonese?

Cantonese is the primary language spoken in Hong Kong, Macau, and the Guangdong province of China. It is also widely spoken in overseas Chinese communities.

What is Simplified Chinese?

Simplified Chinese characters were created to increase literacy rates by reducing the number of strokes. They are officially used in Mainland China and Singapore.

What is Traditional Chinese?

Traditional Chinese characters retain their historical shapes and strokes. They are primarily used in Taiwan, Hong Kong, and Macau.

Which should I choose?

If you plan to visit Mainland China or want to speak with the largest number of people, choose Mandarin + Simplified. If you are interested in Hong Kong culture, media, or visiting Macau, choose Cantonese + Traditional.

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白丁 (Bai Ding)
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Contexts & Encounters

You have encountered in the following lessons:

Link Asset to Content

Media Library
Upload New
  • Cover Image (cover)
  • Thumbnail (thumbnail)
  • Intro Slide (intro_slide)
  • Outro Slide (outro_slide)
  • NPC Avatar (avatar)

Remove Asset

Choose how you want to remove this asset.

Send to Recycle Bin

This will remove the file from all linked content and send it to the Recycle Bin.