PixelSnap 2

PixelSnap answers one question fast: how big is that, and how far is it from the next thing? You hold a shortcut, an overlay appears above every window, and as you move the cursor it snaps to the edges of whatever is underneath — a button in Safari, a row in a running build, a toolbar in someone else's app. Sizes and gaps come back in pixels or points, with a magnifier when you need to be certain about two versus three.

It is the tool for the gap between design and implementation. Checking that the padding in the build matches the padding in the file does not require exporting anything, opening Figma, or squinting at a screenshot in Preview.

$39 covers one Mac; the multi-Mac tiers are for people with a laptop and a desktop rather than teams. If you own CleanShot X — same developer — knock 20% off. If you already pay for Setapp, it is in there and you should not buy it twice.

Do not buy it expecting a capture tool: it measures, it picks colours, and that is all. And if you only need to check spacing when a designer complains twice a year, the free Digital Colour Meter plus a careful screenshot will get you through.