On-screen Ruler is a semi-transparent on-screen ruler to help you lay out GUIs and Web pages or measure anything on your screen. It supports units in centimeters, inches or pixels. In addition to using the mouse, you can keyboard shortcuts to move the ruler around the screen.
This lightweight, free, semi-transparent ruler began as a simple project to teach a child about computers, usability and the software development process. It confirmed that the programme installed correctly on all windows operating systems.[advt]