Overlay your mockup image above the Browser or Simulator and spot the differences like wrong paddings and fonts. The easiest way is to take screenshot from Figma/Sketch/Photoshop/XD — Pixel Perfect Tool monitors Clipboard and instantly displays copied image! Or drag and drop image into the app icon. Keyboard shortcuts: “Arrows” — Move by one pixel (hold Shift to move faster) “+/-” — Zoom (hold Option to zoom slower) “R” — Reset zoom “Ctrl+Shift+Command+4” — macOS shortcut to take screenshot to Clipboard “1-9” — Change opacity “0” — Full opacity “~” — Toggle Hide