#04243E
Closest named color: Oxford Blue (#1B263B). oklch(25.3% 0.061 247.5), rgb(4, 36, 62).
Aa
White text reads best on this color (15.82:1).
About this color
#04243E is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.061 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.028 away. White text reads best on it, at 15.82:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.82:1 |
Values
| HEX | #04243E |
| RGB | rgb(4, 36, 62) |
| HSL | hsl(207, 88%, 13%) |
| OKLCH | oklch(25.3% 0.061 247.5) |
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 #04243E | 15.82:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #04243E | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #04243E text on white | 15.82:1 | AAA | Lc 102.5 | Preferred for body text |
| #04243E text on black | 1.32:1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9BC6EE
oklch(81% 0.073 246.9)
-
Step 400
400
#61A7E5
oklch(70.8% 0.116 247)
-
Step 500
500
#2B8FDE
oklch(63.2% 0.149 247.4)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#054472
oklch(37.7% 0.097 247.7)
-
Step 950
950 (this color)
#04243E
oklch(25.3% 0.061 247.5)
#04243E 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) | #18253F | 0.023 |
| Deuteranopia (no green cones) | #0F203E | 0.016 |
| Tritanopia (no blue cones) | #002A2E | 0.042 |
| Achromatopsia (no color) | #222222 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04243E
#04243E
oklch(25.3% 0.061 247.5)
- #341C00
#341C00
oklch(25.3% 0.056 66.7)
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 #04243E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.028
- Dark #1B2431 ΔE 0.035
- Rich Black #0D1B2A ΔE 0.044
- Jet #212529 ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.063
- Navy Blue #001146 ΔE 0.063
- Marine #042E60 ΔE 0.067
- Gunmetal #293241 ΔE 0.070
Use #04243E 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.