The Color Canon is an online public registry dedicated to naming every color in the RGB color space. It presents itself as the official international registry of hex color names and says its catalog contains all 16,777,216 RGB colors, each with a canonical designation, color values, a description, and an amendment history. Visitors can search for a specific color or explore a randomly selected entry, while the site highlights featured colors, recent amendments, and disputed designations.

The registry’s defining feature is its changeable naming system. Users can amend a color’s canonical name by paying more than its current value; that designation remains in place until someone else offers more. The site clarifies that users are not buying colors, but temporary authority over what they are called. Entries range from playful references and personal dedications to humorous names, with displayed values varying by color. The Color Canon also publishes its rules, amendment records, and information about ownership, alongside contact, terms, and privacy pages.