#042B4A
Closest named color: Oxford Blue (#1B263B). oklch(28.2% 0.071 247.9), rgb(4, 43, 74).
Aa
White text reads best on this color (14.48:1).
About this color
#042B4A is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.071 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.034 away. White text reads best on it, at 14.48:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.44:1 |
| White text | 14.48:1 |
Values
| HEX | #042B4A |
| RGB | rgb(4, 43, 74) |
| HSL | hsl(207, 90%, 15%) |
| OKLCH | oklch(28.2% 0.071 247.9) |
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 #042B4A | 14.48:1 | AAA | Lc -103.9 | Preferred for body text |
| Black text on #042B4A | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #042B4A text on white | 14.48:1 | AAA | Lc 101.0 | Preferred for body text |
| #042B4A text on black | 1.44:1 | 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
#C2DDF7
oklch(88.6% 0.046 247.3)
-
Step 300
300
#95C6F4
oklch(80.9% 0.083 247.3)
-
Step 400
400
#55A7EF
oklch(70.8% 0.133 247.5)
-
Step 500
500
#008EE9
oklch(63.1% 0.169 247.8)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950 (this color)
#042B4A
oklch(28.2% 0.071 247.9)
#042B4A 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) | #1C2D4B | 0.025 |
| Deuteranopia (no green cones) | #112749 | 0.015 |
| Tritanopia (no blue cones) | #003336 | 0.052 |
| Achromatopsia (no color) | #292929 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042B4A
#042B4A
oklch(28.2% 0.071 247.9)
- #3D2200
#3D2200
oklch(28.1% 0.062 67.2)
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 #042B4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.034
- Marine #042E60 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.049
- Dark #1B2431 ΔE 0.050
- Gunmetal #293241 ΔE 0.054
- Midnight Green #073B4C ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.063
Use #042B4A 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.