These metric help for writing a report for the boss. But really, these tools should not be a factor for UI design. They're much better for things like data vis

These metric help for writing a report for the boss. But really, these tools should not be a factor for UI design. They're much better for things like data visualization where you're working wit a lot more colors in a tight space. If somebody is relying on slight variations in hue to differentiate between background and font color, they've already fucked up. FWIW, I recommend using the squint test as a really rough metric, try and see if you can use something through your eyelashes as you're squinting.