#042047
Closest named color: Oxford Blue (#1B263B). oklch(25% 0.081 257.5), rgb(4, 32, 71).
Aa
White text reads best on this color (16.11:1).
About this color
#042047 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.081 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.043 away. White text reads best on it, at 16.11:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.11:1 |
Values
| HEX | #042047 |
| RGB | rgb(4, 32, 71) |
| HSL | hsl(215, 89%, 15%) |
| OKLCH | oklch(25% 0.081 257.5) |
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 #042047 | 16.11:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #042047 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #042047 text on white | 16.11:1 | AAA | Lc 102.8 | Preferred for body text |
| #042047 text on black | 1.30:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFD
oklch(88.5% 0.053 258)
-
Step 300
300
#9AC3FE
oklch(80.9% 0.095 257.4)
-
Step 400
400
#60A1FE
oklch(70.7% 0.152 257.5)
-
Step 500
500
#2E86FC
oklch(63.2% 0.194 257.4)
-
Step 600
600
#006DE6
oklch(55.7% 0.202 257.5)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004AA1
oklch(42.6% 0.155 257.6)
-
Step 900
900
#093F83
oklch(37.8% 0.126 257.3)
-
Step 950
950 (this color)
#042047
oklch(25% 0.081 257.5)
#042047 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) | #082448 | 0.014 |
| Deuteranopia (no green cones) | #001E46 | 0.009 |
| Tritanopia (no blue cones) | #002930 | 0.059 |
| Achromatopsia (no color) | #212121 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042047
#042047
oklch(25% 0.081 257.5)
- #2F1E00
#2F1E00
oklch(25% 0.052 78.5)
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 #042047, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.043
- Navy Blue #001146 ΔE 0.045
- Dark #1B2431 ΔE 0.053
- Rich Black #0D1B2A ΔE 0.055
- Marine #042E60 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.065
- Jet #212529 ΔE 0.072
- Darkblue #030764 ΔE 0.073
Use #042047 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.