About

Birthday Color 366 is an independent data reference publishing all 366 birthday colors (name, HEX, RGB, HSL, color words) for free. It is run by an individual developer, not a company or fortune-telling service.

The 366-day mapping (dates and Japanese color names) follows the Japanese "366 birthday colors" system popularized after 2006, based on the publicly published 366-color table by Cafein. That system traces part of its lineage to Colorstrology (Michele Bernhardt, 2005), but its date-to-color assignments differ from Bernhardt's original table (e.g., January 1 is Baked Clay in Colorstrology, but Shiro/white in this system). HEX values are compiled by this site from the color names and swatches above, and all color-words texts are original to this site.

Multiple birthday color systems exist and publications may assign different colors to the same date. This site uses one consistent mapping everywhere and always prints the HEX code so any value can be verified and reused. The 366-color data table (dates, names, HEX) is licensed CC BY 4.0. Color-words texts, commentary, and design are not covered by that license.