ScreenDraw is a free Android app developed by Prem Nirmal that allows users to draw on their screens. Whether it's to highlight directions on Google Maps or annotate a document, ScreenDraw offers an easy way to draw on any application, with different colors and stroke widths via the color picker. The app provides an icon that is always visible, unless turned off via the notification menu. When the user clicks on the icon, drawing mode is enabled and they can draw anywhere on their screen.

The app is easy to use and provides a simple solution for those who need to draw on their screens. However, it should be noted that ScreenDraw is not a standalone app and requires another application to work with. Additionally, the app uses the open-source library Magnet, which may raise some concerns regarding privacy and security. Overall, ScreenDraw is a great utility app for those who need to draw on their screens and its simplicity makes it easy to use.