To cite package ‘colourpicker’ in publications use:

  Attali D (2025). _colourpicker: A Colour Picker Tool for Shiny and
  for Selecting Colours in Plots_. R package version 1.3.0, ,
  <https://github.com/daattali/colourpicker>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {colourpicker: A Colour Picker Tool for Shiny and for Selecting Colours in
Plots},
    author = {Dean Attali},
    year = {2025},
    note = {R package version 1.3.0, 
},
    url = {https://github.com/daattali/colourpicker},
  }