A simple interface for seeing the classes selected by d3-scale-cluster for your data, colours and number of classes. You can enter your own colour choices (or select good colours from ColorBrewer etc). I made this tool as I needed to manually create the colour schemes in other mapping applications.
The tool uses jscolor for the colour pickers.
https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js
https://oss.maxcdn.com/respond/1.4.2/respond.min.js