The Color Blindness feature allows you to have a hint of how color blind people will see your palette.
To use it just click on the glasses icon in the top-right corner of the Generator.
In the sidebar panel that opens you can find listed all the different types of color blindness.
By selecting them you will see on the left side the original colors compared with the perceived ones.
You can also download a color blindness map by exporting your palette as PDF.