xScope

xScope is a macOS‑only suite of on‑screen utilities that give designers and developers pixel‑perfect measuring, alignment, and inspection tools. It offers Rulers, Dimensions, Guides, Crosshair, Loupe, Mirror previews, Overlay grids, Screens device frames, Text analysis, a color picker and vision‑impairment simulation, streamlining UI/UX workflows and speeding hand‑off.