xScope

xScope is a comprehensive design and development toolkit for Mac that provides inspectors, rulers, guides, color pickers, and measurement tools to help developers, designers, and web professionals build and verify pixel-perfect layouts. The app includes an on-screen measuring system, contrast checkers, accessibility validators, and integration with design tools like Sketch and Figma. It sits in the menu bar and offers instant access to tools for measuring distances, sampling colors, checking typography, and validating UI alignment without leaving your work.