AI Letter is a service for easily writing warm letters and sharing them via QR code. It supports 15 language UIs, and you can unlock features like typing effect, animation, and permanent storage by watching ads. Even if ads fail, we provide free unlocking.

Key Features:

📝 AI Letter Writing
Generate emotional letters of 800-1200 characters in your desired language
Natural expressions and warm feelings powered by AI

🌍 15 Languages Supported
UI Languages: English, Korean, Arabic, German, Spanish, French, Indonesian, Italian, Japanese, Portuguese, Russian, Thai, Vietnamese, Chinese (Simplified/Traditional)
Letter content creation in any language

📱 QR Code Sharing
Convert generated letters into QR codes
Share link, copy, and save as image
Easy preview with temporary token link

✨ Premium Features via Ads
Typing Effect: Display letter one character at a time
Envelope Animation: Beautiful envelope opening
No Expiration: Permanent storage instead of 7 days
Free unlock even when ads fail

🔒 Security & Privacy
Secure storage based on Firebase
Letter access protected by tokens and rules
Anonymous login only
No data sales or sharing

How to Use:
Enter your desired letter topic
AI generates an emotional letter
Watch ad to unlock effects (free unlock on failure)
Create QR code and share letter
Recipient reads letter by scanning QR

Detailed Features:
Default storage period: 7 days (extendable to unlimited)
Share/Copy/Save buttons available on QR screen
Simple system with anonymous login
No personal information required
Secure environment based on Cloud Functions

AI Letter is the perfect way to convey your warm feelings. Easily share special moments with your loved ones!