Cerulean Blue #056EEE
Cerulean Blue is a medium-dark, vivid blue with hex code #056EEE and RGB rgb(5, 110, 238).
Aa
White text reads best on this color (4.69:1).
About this color
#056EEE is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.210 and its hue 258°. Its hue sits on the cool side of the wheel. It is the named color Cerulean Blue. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.210) |
| Temperature | cool |
| Nearest name | Cerulean Blue |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Colors that go with Cerulean Blue
Matches found by rotating Cerulean Blue around the OKLCH hue wheel, each labelled with the closest name in our list.
Complementary
The opposite hue (180°).
Analogous
Neighbouring hues, 30° either side.
Triadic
Three hues spaced 120° apart.
Color palettes with Cerulean Blue
Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Cerulean Blue, closest first.
Similar named colors
The eight named colors closest to Cerulean Blue, with their ΔE distance.
- Bright Blue #0165FC ΔE 0.030
- Royal Blue #4169E1 ΔE 0.036
- Azul #1D5DEC ΔE 0.039
- Clear Blue #247AFD ΔE 0.040
- Neon Blue #4361EE ΔE 0.041
- Electric Blue #0652FF ΔE 0.067
- Warm Blue #4B57DB ΔE 0.067
- Windows Blue #3778BF ΔE 0.083
More about Cerulean Blue
How to make Cerulean Blue
A starting recipe from common paint colors, found with a spectral paint model (the color mixer’s paint mode). Real pigments vary, so mix a small test batch and adjust.
- 2 parts blue
- 1 part white
Recipe result: #3775CE, a difference of ΔE 0.059 from Cerulean Blue. That is close; add a little more of one paint to match.
Codes for Cerulean Blue in every format
| HEX | #056EEE |
| RGB | rgb(5, 110, 238) |
| HSL | hsl(213, 96%, 48%) |
| OKLCH | oklch(56.6% 0.21 258.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #056EEE | 4.69:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #056EEE | 4.47:1 | AA large text | Lc 32.4 | Non-text elements, placeholder text |
| #056EEE text on white | 4.69:1 | AA | Lc 71.7 | Content text, not long reading |
| #056EEE text on black | 4.47:1 | AA large text | Lc -29.9 | Dividers and decoration only |
Shades and tints of Cerulean Blue
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFC
oklch(88.5% 0.052 257.4)
-
Step 300
300
#9BC3FE
oklch(81% 0.094 258)
-
Step 400
400
#63A0FD
oklch(70.6% 0.151 258.6)
-
Step 500
500
#3485FB
oklch(63.1% 0.193 258.4)
-
Step 600
600 (this color)
#056EEE
oklch(56.6% 0.21 258.4)
-
Step 700
700
#005AC6
oklch(49.1% 0.184 258.2)
-
Step 800
800
#0049A4
oklch(42.7% 0.16 258.3)
-
Step 900
900
#0D3E83
oklch(37.7% 0.127 258.5)
-
Step 950
950
#0A254D
oklch(27% 0.081 258.5)
Cerulean Blue with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #007EF2 | 0.040 |
| Deuteranopia (no green cones) | #006BEC | 0.008 |
| Tritanopia (no blue cones) | #008EA3 | 0.159 |
| Achromatopsia (no color) | #747474 | 0.210 |
Use Cerulean Blue in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.