They've been absolutely invaluable for making sure their kind of people can't use my apps properly.
It is not a fun condition to have, and leads to lots of problems in my everyday life. This blog post accidentally accentuated that issue, since the colors are (to what I can understand) very similar looking to me as a colorblind person.
1 in 12 men and 1 in 200 women go through the same sorts of experiences, and it’s worth it, if you aren’t color deficient, to try out some of the colorblindness sites and see the world as we do.
https://www.colourblindawareness.org/colour-blindness/colour...
Not the same, it's a gradient.
Yours is on the much stronger side of the things.
Almost everyone to an extent loses some colour definition in their vision as we age, even those lucky enough to have excellent colour vision to start with, some lose a lot more than others and it is gradual so mostly not noticed at first. The is one of the reasons many grandparents have the saturation oddly high on their TVs (the other main reason, of course, being they've just never changed it from the default that is picked to make the display “pop” under bright show-room lighting conditions).
It has a little window you can move over the screen to simulate a few varieties of color blindness.
That is better then a random friend, because a.) there are various kinds of colorblindness b.) you wont ask the random friend to work for your company for free.
A filter shader generally won't tell you that substituting white for green in a red/green indicator is a great option, or that a colour that they can “see” is still ambiguous when you have to describe it: “I'm clicking the purple button, but it's not doing anything” “Purple? There's no purple in the app!”
In the absence of any naturally occuring colour-blind friends, do you have any tips about surrptitious damaging someone's eyes to create one? :-)
Though there are simulation tools avaliable which do a reasonable job, I'll probably stick to those where I have a concern. That feels less drastic.
This is such an app for iOS / macOS: https://michelf.ca/projects/sim-daltonism/
Why would you do that?
https://www.color-blindness.com/coblis-color-blindness-simul...
.. to get an idea of the impact of your UI design on color-limited folks out there ..
I used this a few times to great effect, it was very revealing to see that my carefully selected teals and ambers were incomprehensible to some folks I really wanted to use my apps .. didn't take much iteration to come to a happy palette though, just needed a bit of care.