KRuler

KRuler is a screen measurement utility developed as part of the KDE desktop environment for Linux systems. The application places a horizontal ruler overlay directly onto the display workspace, enabling users to measure distances in pixels between any two points on the screen. It provides a straightforward mechanism for designers and developers who need to check interface layouts, element spacing, or window dimensions.

The ruler interface supports custom length adjustments, theme modifications, and rotation to measure vertical dimensions. Users can inspect color codes beneath the cursor and move the measurement scale using keyboard shortcuts for precise positioning. The tool operates as a lightweight desktop accessory intended to assist with basic visual verification tasks on compatible window managers.