How can I ensure that my design works for colorblind people?

How can I ensure that my designs work for colorblind people?
Whether for web or print…
My teachers always said that red and black don’t mix well, but how can I know for sure?

Are there do’s & dont’s? Or tools that I can use?


You can use some simulators.

Make a snapshot of your website and upload it for example on this page:

Source : Link , Question Author : curious , Answer Author : Rafael

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