Detexify is an Android app developed by Olivier Marty that allows users to draw a symbol and find the closest LaTeX symbols, their commands, packages, and modes. This app is perfect for students, researchers, and professionals who frequently use LaTeX for their work.

One of the best features of Detexify is that it uses very little mobile data since the symbols are already in the app, and the server sends only a small amount of data. This makes it an ideal app for those who are always on the go and need quick access to LaTeX symbols. Overall, Detexify is a great app that does exactly what it promises and is a must-have for anyone who uses LaTeX regularly.