Ultramarine Blue Color – #657abb: Codes and Complete Breakdown
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The Ultramarine Blue color hex code is #657abb, and it is composed of 40% red, 48% green and 73% blue.
Ultramarine Blue is a dark, muted, and cool color at 46% saturation. It has a contrast ratio of 4.15:1 against a white background, which fails WCAG AA (Web Content Accessibility Guidelines, Level AA) compliance.
For better visibility, it is recommended to use the Ultramarine Blue color (#657abb) against dark backgrounds.

Ultramarine Blue Color Shades
Complementary colors
Triadic colors
Tints or lighter colors
Darker colors
Analogous colors
Monochromatic colors
#657abb
Ultramarine Blue Color Codes and Information
Here’s a complete breakdown of the color Ultramarine Blue, including its HEX, RGB, HSL, and CMYK values, as well as other information about the color.
| Data Type | Values/Details |
|---|---|
| Hex | #657abb |
| RGB | rgb(101,122,187) |
| HSL | hsl(225,38.7%,56.5%) |
| CMYK | 46, 35, 0, 27 |
| HSV | 225, 46, 73 |
| RGB % | 40, 48, 73 |
| XYZ | 21.3, 20.3, 49.8 |
| LAB | 52.2, 9.8, -36.6 |
| Color Category | Dark |
| Color Family | Blue |
| Saturation | 46% |
| Temperature | Cool |
| Contrast Ratio Againt White (#ffffff) | 4.15 (fails WCAG AA) |
| Contrast Ratio Againt Black (#000000) | 5.05 (passes WCAG AA) |
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