i Sign is a free Android application developed by YZ. It falls under the category of Utilities & Tools and is designed to help users learn Bahasa Isyarat Indonesia (Bisindo). The app offers an easy way to understand Indonesian sign language through videos that demonstrate the movements and how to convey them. With the quick search feature, users can easily find the Indonesian sign language they are looking for.

The app also allows the sign language community to share their information so that people can find them and learn from them. Users can share their sign language with friends as well. Overall, i Sign is a great tool for anyone interested in learning Bahasa Isyarat Indonesia.