#042D51
Closest named color: Marine (#042E60). oklch(29.2% 0.078 250.3), rgb(4, 45, 81).
Aa
White text reads best on this color (14.00:1).
About this color
#042D51 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.078 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.027 away. White text reads best on it, at 14.00:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.49:1 |
| White text | 14.00:1 |
Values
| HEX | #042D51 |
| RGB | rgb(4, 45, 81) |
| HSL | hsl(208, 91%, 17%) |
| OKLCH | oklch(29.2% 0.078 250.3) |
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 #042D51 | 14.00:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #042D51 | 1.49:1 | Fails | Lc 0.0 | Not readable |
| #042D51 text on white | 14.00:1 | AAA | Lc 100.3 | Preferred for body text |
| #042D51 text on black | 1.49:1 | 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
#EFF6FE
oklch(97% 0.013 251.6)
-
Step 100
100
#DDECFC
oklch(93.7% 0.027 249.9)
-
Step 200
200
#C0DCFB
oklch(88.4% 0.052 251.1)
-
Step 300
300
#93C5FB
oklch(80.8% 0.093 250.9)
-
Step 400
400
#4FA5F9
oklch(70.7% 0.149 250.3)
-
Step 500
500
#008CF1
oklch(63.1% 0.18 250.4)
-
Step 600
600
#0075CB
oklch(55.5% 0.159 250.4)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800
#00508E
oklch(42.6% 0.122 250.5)
-
Step 900
900
#004378
oklch(37.8% 0.108 250.3)
-
Step 950
950 (this color)
#042D51
oklch(29.2% 0.078 250.3)
#042D51 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) | #1B2F52 | 0.023 |
| Deuteranopia (no green cones) | #0E2950 | 0.013 |
| Tritanopia (no blue cones) | #00363B | 0.057 |
| Achromatopsia (no color) | #2C2C2C | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042D51
#042D51
oklch(29.2% 0.078 250.3)
- #3F2500
#3F2500
oklch(29.1% 0.063 70.3)
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 #042D51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.038
- Oxford Blue #1B263B ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.051
- Midnight Green #073B4C ΔE 0.051
- Marine Blue #01386A ΔE 0.053
- Gunmetal #293241 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.058
Use #042D51 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.