The world’s first Japanese Sign Language (JSL) and American Sign Language (ASL) dictionary and translation app.

Discover a faster, easier way to learn and compare Japanese Sign Language and American Sign Language. Whether you’re a student, educator, interpreter, traveler, or simply interested in sign language, SignDict provides a modern learning experience designed exclusively for Apple platforms.

Built entirely with SwiftUI, SignDict features a beautiful native interface, powerful search, offline access, and cross-platform support for iPhone, iPad, Mac, and Apple Vision Pro.

Features

• JSL ⇄ ASL Dictionary & Translation
Explore thousands of signs with side-by-side translations between Japanese Sign Language and American Sign Language.

• Fast Search
Search instantly using English, Hiragana, Kanji, or Katakana to quickly find the sign you’re looking for.

• Interactive Learning
Learn through structured lessons, practice sessions, quizzes, Hiragana charts, Dakuon, Yōon, and more.

• Compare Signs Side by Side
Understand the differences between American and Japanese Sign Language with an easy-to-read comparison interface.

• Offline Access
Study anywhere—even without an internet connection. Perfect for travel, flights, classrooms, and everyday learning.

• Designed for Apple Platforms
Built entirely with SwiftUI and featuring Apple’s native Liquid Glass design for a fast, responsive, and beautiful experience across iPhone, iPad, Mac, and Apple Vision Pro.

• Privacy First
No accounts. No advertisements. Your learning stays private.

• Active Development
SignDict is continuously updated with new signs, improved illustrations, enhanced translations, and new learning features.

Community Feedback

Sign language evolves through its community.

If you’d like to request a new sign or report a correction, you can submit feedback directly within the app by going to Settings → Feedback.

Many improvements to the Japanese Sign Language dictionary have been made thanks...