The best alternatives to UI Check are Shift Nudge, Dimensions, and Interface Index. If these 3 options don't work for you, we've listed a few more alternatives below.
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Shift Nudge is a new online course that teaches the intricate skills of designing visually beautiful interfaces, while balancing functionality and accessibility.
A tool for designers to measure screen dimensions
This extension measures the dimensions from your mouse pointer up/down and left/right until it hits a border. So if you want to measure distances between elements on a website this is perfect. It doesn't really work with images because there the colors change a lot pixel to pixel.
The «Interface Index» is a 🏷 collection of UI elements from great B2B, SaaS and desktop applications and services – such as GitHub, Mailchimp or Loom. You can use it to 🏎 speed up your interface research or as 👩🎨 visual inspiration.
MeasureMate the ultimate tool for measuring distances between elements on webpages. It lets you just select the element and then check all the distances to any other element. You can select the whole element or only the content box.