#042B4C
Closest named color: Marine (#042E60). oklch(28.3% 0.074 249.3), rgb(4, 43, 76).
Aa
White text reads best on this color (14.43:1).
About this color
#042B4C is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.074 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.037 away. White text reads best on it, at 14.43:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.45:1 |
| White text | 14.43:1 |
Values
| HEX | #042B4C |
| RGB | rgb(4, 43, 76) |
| HSL | hsl(207, 90%, 16%) |
| OKLCH | oklch(28.3% 0.074 249.3) |
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 #042B4C | 14.43:1 | AAA | Lc -103.9 | Preferred for body text |
| Black text on #042B4C | 1.45:1 | Fails | Lc 0.0 | Not readable |
| #042B4C text on white | 14.43:1 | AAA | Lc 100.9 | Preferred for body text |
| #042B4C text on black | 1.45:1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFA
oklch(93.7% 0.024 248.1)
-
Step 200
200
#C1DCF8
oklch(88.4% 0.048 249.3)
-
Step 300
300
#95C6F7
oklch(81% 0.087 248.9)
-
Step 400
400
#54A6F3
oklch(70.7% 0.139 249.1)
-
Step 500
500
#008DED
oklch(63.1% 0.175 249.1)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950 (this color)
#042B4C
oklch(28.3% 0.074 249.3)
#042B4C 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) | #1B2D4D | 0.024 |
| Deuteranopia (no green cones) | #0F274B | 0.014 |
| Tritanopia (no blue cones) | #003337 | 0.054 |
| Achromatopsia (no color) | #2A2A2A | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042B4C
#042B4C
oklch(28.3% 0.074 249.3)
- #3D2300
#3D2300
oklch(28.3% 0.062 69)
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 #042B4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.050
- Dark #1B2431 ΔE 0.053
- Gunmetal #293241 ΔE 0.055
- Midnight Green #073B4C ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.063
Use #042B4C 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.