Sign ASL is an educational and reference program available on the iPhone platform. Developed by Daniel Mitchell, this free app offers users the ability to search and compare thousands of words and phrases in American Sign Language (ASL). With over 20,000 videos in its video dictionary, Sign ASL provides a comprehensive resource for individuals interested in learning and understanding ASL.

The program allows users to easily find and view signs on their mobile devices. Whether you are a beginner or an advanced learner, Sign ASL offers a user-friendly interface that makes it accessible to all. The app's extensive video dictionary ensures that users have access to a wide range of signs, allowing them to expand their ASL vocabulary and improve their communication skills.