#042A54
Closest named color: Marine (#042E60). oklch(28.7% 0.087 254.6), rgb(4, 42, 84).
Aa
White text reads best on this color (14.34:1).
About this color
#042A54 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.087 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.024 away. White text reads best on it, at 14.34:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.46:1 |
| White text | 14.34:1 |
Values
| HEX | #042A54 |
| RGB | rgb(4, 42, 84) |
| HSL | hsl(212, 91%, 17%) |
| OKLCH | oklch(28.7% 0.087 254.6) |
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 #042A54 | 14.34:1 | AAA | Lc -103.7 | Preferred for body text |
| Black text on #042A54 | 1.46:1 | Fails | Lc 0.0 | Not readable |
| #042A54 text on white | 14.34:1 | AAA | Lc 100.7 | Preferred for body text |
| #042A54 text on black | 1.46:1 | 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
#DDEBFE
oklch(93.5% 0.03 256)
-
Step 200
200
#C0DCFF
oklch(88.5% 0.057 254.1)
-
Step 300
300
#95C4FF
oklch(80.9% 0.098 254.5)
-
Step 400
400
#56A2FF
oklch(70.6% 0.156 254.7)
-
Step 500
500
#0887FF
oklch(63% 0.202 254.6)
-
Step 600
600
#0071D9
oklch(55.6% 0.181 254.6)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#004D98
oklch(42.6% 0.139 254.8)
-
Step 900
900
#004080
oklch(37.6% 0.123 254.7)
-
Step 950
950 (this color)
#042A54
oklch(28.7% 0.087 254.6)
#042A54 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) | #132E56 | 0.019 |
| Deuteranopia (no green cones) | #012753 | 0.010 |
| Tritanopia (no blue cones) | #00343A | 0.065 |
| Achromatopsia (no color) | #2A2A2A | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042A54
#042A54
oklch(28.7% 0.087 254.6)
- #3C2500
#3C2500
oklch(28.6% 0.061 74)
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 #042A54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.024
- Prussian Blue #1D3557 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.049
- Marine Blue #01386A ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.058
- Midnight Green #073B4C ΔE 0.062
- Gunmetal #293241 ΔE 0.064
- Dark #1B2431 ΔE 0.066
Use #042A54 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.