Cerulean Blue #056EEE
Cerulean Blue is a mid-tone, vivid cool color (#056EEE; HSL 213° 96% 48%). Name from the public-domain xkcd color survey (CC0), where it was contributed as “cerulean blue”.
Use cases: Trust UI · Corporate accents
Families: Blues
Color values
| Format | Value | |
|---|---|---|
| HEX | #056EEE | |
| RGB | rgb(5, 110, 238) | |
| HSL | hsl(213, 96%, 48%) | |
| HSV | hsv(213, 98%, 93%) | |
| OKLCH | oklch(56.55% 0.21 258.4) | |
| OKLab | oklab(56.55% -0.0423 -0.2059) | |
| CMYK | cmyk(97.9%, 53.8%, 0%, 6.7%) | |
| XYZ | xyz(21.0654, 17.3543, 83.1118) | |
| CIE-LAB | lab(48.7, 23.7, -71.2) | |
| CIE-LCH | lch(48.7, 75.1, 288.4°) | |
| Luminance | 0.174 (WCAG relative) |
Source: xkcd color survey name (public domain, CC0). CSS keyword: ceruleanblue.
Collections: Vibrant Colors · Neon Colors · Ocean Colors
Shade scale
Perceptual 50–950 scale, interpolated in CIE-LAB. Step 500 is the base color. Edit in the shade generator →
OKLCH ramp (perceptually uniform, modern CSS)
Shades (toward black)
Tints (toward white)
Tones (toward gray)
Color harmonies
Complementary
Edit in generator →Analogous
Edit in generator →Triadic
Edit in generator →Tetradic
Edit in generator →Square
Edit in generator →Split Complementary
Edit in generator →Monochromatic
Edit in generator →Accessibility & contrast
Best text on cerulean blue
WCAG 2.1: AA needs ≥4.5:1 for normal text, ≥3:1 for large text and UI components; AAA needs ≥7:1 / ≥4.5:1. Open the contrast checker →
Color blindness preview
Simulation using the Machado et al. (2009) physiological model, severity 1.0. This is an approximation of perception — not a medical assessment.
Closest named colors
Nearest matches by CIEDE2000 perceptual distance (ΔE₀₀) across the full color database.
| Color | Name | ΔE₀₀ |
|---|---|---|
| Bright Blue #0165FC | 3.80 | |
| Royal Blue #4169E1 | 4.11 | |
| Clear Blue #247AFD | 4.69 | |
| Cornflower Blue #5170D7 | 5.06 | |
| Medium Blue #2C6FBB | 5.50 | |
| Azul #1D5DEC | 6.21 |
Related colors
Colors that go with cerulean blue
Top matches by hue harmony, contrast and saturation compatibility.
Values computed from the sRGB color model. CMYK is the naive sRGB conversion without an ICC profile. RGB percentages may differ between color-managed applications.