#042E5A
Closest named color: Marine (#042E60). oklch(30.2% 0.09 253.9), rgb(4, 46, 90).
Aa
White text reads best on this color (13.60:1).
About this color
#042E5A is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.090 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.011 away. White text reads best on it, at 13.60:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.54:1 |
| White text | 13.60:1 |
Values
| HEX | #042E5A |
| RGB | rgb(4, 46, 90) |
| HSL | hsl(211, 91%, 18%) |
| OKLCH | oklch(30.2% 0.09 253.9) |
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 #042E5A | 13.60:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #042E5A | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #042E5A text on white | 13.60:1 | AAA | Lc 99.7 | Preferred for body text |
| #042E5A text on black | 1.54:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
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 950.
-
Step 50
50
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DCECFF
oklch(93.7% 0.031 252.7)
-
Step 200
200
#C0DCFF
oklch(88.5% 0.057 254.1)
-
Step 300
300
#94C4FF
oklch(80.8% 0.098 254)
-
Step 400
400
#54A3FF
oklch(70.7% 0.156 253.8)
-
Step 500
500
#0088FE
oklch(63.1% 0.201 253.9)
-
Step 600
600
#0072D7
oklch(55.6% 0.177 254)
-
Step 700
700
#0060B6
oklch(49.2% 0.156 253.8)
-
Step 800
800
#004E96
oklch(42.7% 0.135 253.8)
-
Step 900
900
#00417F
oklch(37.8% 0.12 253.9)
-
Step 950
950 (this color)
#042E5A
oklch(30.2% 0.09 253.9)
#042E5A 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) | #16325C | 0.021 |
| Deuteranopia (no green cones) | #022A59 | 0.013 |
| Tritanopia (no blue cones) | #00393F | 0.068 |
| Achromatopsia (no color) | #2E2E2E | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042E5A
#042E5A
oklch(30.2% 0.09 253.9)
- #412800
#412800
oklch(30.1% 0.064 73.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #042E5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.011
- Prussian Blue #1D3557 ΔE 0.035
- Marine Blue #01386A ΔE 0.039
- Midnight Green #073B4C ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.060
- Gunmetal #293241 ΔE 0.062
Use #042E5A 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.