To cite colorblindcheck in publications, please use:

  Nowosad, J. (2019). colorblindcheck: Check Color Palettes for
  Problems with Color Vision Deficiency. R package version 0.1.0.
  https://jakubnowosad.com/colorblindcheck/

A BibTeX entry for LaTeX users is

  @Manual{,
    author = {Jakub Nowosad},
    title = {Check Color Palettes for Problems with Color Vision Deficiency},
    year = {2019},
    note = {R package version 0.1.0},
    url = {https://jakubnowosad.com/colorblindcheck/},
  }