colo

A simple script that prints out the 256 terminal colors in different formats.
It can print the numbers, the hex value, rgb,hsi and the ansi escape sequence.

colo --help
usage: colo [-h] [--ansi] [--hsi] [--rgb] [--number] [--name] [--hex]

optional arguments:
  -h, --help  show this help message and exit
  --ansi      bool
  --hsi       bool
  --rgb       bool
  --number    bool
  --name      bool
  --hex       bool

How to get

pipx install colo

Also since this is a very small package without any dependencies you could always use pipx run without "installing the package":

pipx run colo