Colorblind: Checking figure accessibility for colour blind people

For anyone working on a Mac, I highly recommend Sim Daltonism. It gives you an interactive display on your Mac that you can place over any section of your screen to simulate what it looks like to a colorblind person. It simulates several different types of colorblindness. I have a friend who is colorblind, and to the best of our mutual understanding, it is accurate.

https://apps.apple.com/us/app/sim-daltonism/id693112260

As someone who is colorblind, I recommend testing accessibility with grayscale.

If it works in grayscale, it should work for basically all colorblindness types.

Neat but still hard for me (red/green) to differentiate colors between some. The Merge + Tubulin one in particular.

Can a colorblind person remap colors on their own screen?

Why does this single headline use two different spellings for the word colo(u)r?