CrossHair

A pair of 1-pixel lines follows your cursor across every window and app. It stays razor-thin regardless of display size — surgical accuracy, not decoration. One keystroke to summon (⌘⌥X), Esc to dismiss.

A circular magnified view centered on your cursor, with an optional pixel-accurate grid. Size the glass, adjust zoom, and walk the reticle one source pixel at a time — independent of the system cursor. Land on the exact pixel you need and read its neighbours without disturbing anything else.

Drop laser-thin alignment lines anywhere on screen and leave them there. Drag to reposition, nudge by the pixel with arrow keys, undo with ⌘Z. Lock them and every click and keystroke passes straight through to the app underneath — the guides stay visible while you keep working.

Drag out a line and read the length in points; hover to flip the readout to pixels. Click once inside a flat-colour region and the ruler auto-fits a cross to the full width and height of that area — size a button, a margin, a sidebar, or a padding gap in one click. Confirm to lock the overlay click-through so measurements stay on screen while you continue.

Menu-bar icon, or hide it entirely and run on hotkeys alone. Every shortcut is rebindable in Preferences. Built in SwiftUI and AppKit as a universal binary — light and dark modes out of the box, instant launch, nothing running in the background.

CrossHair needs Screen Recording permission to read the pixels under your cursor — that's what powers the loupe and colour reads. macOS asks the first time a feature needs it. CrossHair also shows its own explainer first, so you always know exactly why.