This online check on colorblindness gives you an indication of whether you might be colorblind or not. Of course, the check does not replace a professional medical diagnosis. The 14 color charts used in the check were developed by Prof. Dr. Shinobu Ishihara from the University of Tokyo.
Clicking on the link will automatically start the sequence of color charts. At the end of the check, you will receive your result: https://adi3d.at/rif30/colors/en/