Based on our record, EpicRuler seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can check it out on https://epicruler.com. Source: about 2 years ago
For EpicRuler I'm using this code to get the luminance of a pixel, which I think could be used in your case too, you just have to convert the RGB part to HEX:. Source: about 2 years ago
On-Screen Ruler - lightweight, free, semi-transparent ruler
PixelSnap - Measure every pixel on your screen with ease ✨
Meazure - What are the dimensions of that image? How big is this window?
xScope - xScope is an excellent utility that is used to measure the graphic layouts or any application’s dimensions for checking the operating systems’ compatibility with the desktop screen.
JR Screen Ruler - JR Screen Ruler, also known as JRuler - Free virtual ruler for your computer screen.
QuickLens - Inspect the UI of apps, illustrations & websites like a pro