Screen Loupe

A zoomed monitor exactly where you need it. Pin a frame over any part of the screen, keep working there with your normal mouse and keyboard, and watch that spot magnified — live, pixel-true and perfectly still — in a window next to it.

Made for UI designers checking how a design actually renders, for front-end and Apple-platform developers tuning layout, and for anyone writing a design review or a bug report who needs a crisp, zoomed picture of exactly what is on screen.

WORK IN PLACE • Clicks inside the frame go to the app underneath, so hover states stay live while the Viewer shows them big — on the same display or another one. • The Viewer keeps its zoom and framing while you move or resize the frame. Nothing moves on its own. • Snap the frame to window edges with ⌘, fit it to a window in one click, or attach it with the magnet so it follows the window as it moves and resizes. • Margins capture only an inner part of that window, such as a web page without the browser's toolbar. • A handle on the frame pans the Viewer right from the frame.

PIXEL-TRUE • At 800% every screen pixel is a crisp 8×8 square, never a blur, on Retina and non-Retina displays alike. • Zoom presets from Fit to 16×, or any value by pinch, scroll or a typed percentage. Presets glide smoothly.

INSPECT • Color Meter: HEX, CSS rgb(), SwiftUI Color, AppKit NSColor and the native display value, each one click to copy. Recent colours and eight favourites, kept between launches. • Contrast: a text and a background colour, the WCAG 2 ratio and AA and AAA verdicts. • Rulers in pixels and points: a corner ruler you place, and a selection ruler for a selection's width and height. • A pixel grid on the exact pixel boundaries. • Reference layers: lay a design export over the live screen in Difference, and matching pixels turn black. • Before and after: use a snapshot or the frozen frame as a reference, change the code, and whatever moved glows. • Open, drop or paste an image file and inspect it with the same tools.

SEE IT AS OTHERS DO • Colour vision simulation: protanopia, protanomaly, deuteranopia, deuteranomaly, tritanopia and grayscale, live over any app while you edit — and in Copy View, for a bug report.

COPY EXACTLY WHAT YOU SEE • Copy View: the zoomed view as it looks, ready for a review or a bug report. • Copy Source: the area at native resolution, unmagnified. • Copy a selection snapped to whole pixels, or Option-drag any region. Save as PNG.

SCREENSHOT STUDIO Exact, clean pictures for App Store and website screenshots, docs and bug reports. • Exact pixel sizes, including the Mac App Store's, your own sizes and Aspect Lock. • A 3, 5 or 10 second timer to catch a menu or a hover. • A colour, gradient or image background, shown on screen under every window. • One window alone, whole even where it is covered, with or without its shadow. • PNG, JPEG or HEIC, sRGB or the display's colours, with no date, device or location in the file.

CATCH TRANSIENT STATES • Freeze the view from any app with a global shortcut while the mouse is still held down, or after a countdown. • Take Snapshot (⌘T) keeps the moment in Recent Captures, with opened images, to inspect later — also after a restart. • Link snapshots to share one zoom and position, and flip between the light and the dark theme at the same spot.

OUT OF THE WAY • At rest the frame is a hairline; handles appear only when the cursor comes near. • The app's own windows never show up in its capture. • Global shortcuts, a menu bar item, and a menu-bar-only mode.

PRIVACY Screen Loupe needs Screen Recording access to see the screen. What it captures stays on your Mac: no account, no analytics, no network. The app collects no data.

Free and open source (MIT).

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